How can I bind "FN+X" to "L_SHIFT + L_CTRL + L_ALT + L_CMD"? (aka hyper mod key)

[rublev]

I would post some code but I've been trying for hours to get literally anything working and I'm struggling lol.

I want to bind the hyper key combo to just FN+X so then I can do things like FN+X+ in SKHD to control my yabai window manager without having to press SHIFT+CTRL+ALT+CMD+ which is way more presses.

I have a 60% pok3r keyboard and I can't figure out how to bind this key combo so I thought I'd use karabiner to do the same.

edit: I have the following in my karabiner.json but it doesn't do anything:

"complex_modifications": {
    "parameters": {
        "basic.simultaneous_threshold_milliseconds": 50,
        "basic.to_delayed_action_delay_milliseconds": 500,
        "basic.to_if_alone_timeout_milliseconds": 1000,
        "basic.to_if_held_down_threshold_milliseconds": 500,
        "mouse_motion_to_scroll.speed": 100
    },
    "rules": [
        {
            "manipulators": [
                {
                    "description": "Change x to hyper.",
                    "from": {
                        "key_code": "x",
                        "modifiers": {
                            "mandatory": [
                                "fn"
                            ]
                        }
                    },
                    "to": [
                        {
                            "key_code": "left_shift",
                            "modifiers": [
                                "left_alt",
                                "left_command",
                                "left_control",
                            ]
                        }
                    ],
                    "type": "basic"
                }
            ]
        }
    ]
},

edit 2: this works well but its still annoying.

"complex_modifications": {
                "rules": [
                    {
                        "manipulators": [
                            {
                                "description": "Change left_ctrl aka caps lock to command+control+option+shift. left_ctrl if no other key used.",
                                "from": {
                                    "key_code": "left_control",
                                    "modifiers": {
                                        "optional": [
                                            "any"
                                        ]
                                    }
                                },
                                "to_if_held_down": [
                                    {
                                        "key_code": "left_shift",
                                        "modifiers": [
                                            "left_command",
                                            "left_control",
                                            "left_option"
                                        ]
                                    }
                                ],
                                 "parameters": {
                                    "basic.to_if_alone_timeout_milliseconds": 250,
                                    "basic.to_if_held_down_threshold_milliseconds": 250
                                },
                                "to_if_alone": [
                                    {
                                        "key_code": "left_control",
                                        "modifiers": [
                                            "any"
                                        ]
                                    }
                                ],
                                "type": "basic"
                            }
                        ]
                    }
                ]
            },

edit 3: i think i got it working. now if i press FN+X+ENTER (rebound lctrl to fn on my pok3r) it reads my skhd config and opens iterm!

            "complex_modifications": {
                "rules": [
                    {
                        "manipulators": [
                            {
                                "description": "Change left_ctrl aka caps lock to command+control+option+shift. left_ctrl if no other key used.",
                                "from": {
                                    "key_code": "x",
                                    "modifiers": {
                                        "optional": [
                                            "fn"
                                        ]
                                    }
                                },
                                "parameters": {
                                    "basic.to_if_alone_timeout_milliseconds": 0,
                                    "basic.to_if_held_down_threshold_milliseconds": 0
                                },
                                "to_if_held_down": [
                                    {
                                        "key_code": "left_shift",
                                        "modifiers": [
                                            "left_command",
                                            "left_control",
                                            "left_option"
                                        ]
                                    }
                                ],
                                "type": "basic"
                            }
                        ]
                    }
                ]
            },

Can anyone help me out? Thanks!

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