Can Keycode MT() be expanded to allow MO() as a modifier?

[ExperimentsWithCode]

Essentially I am on a minivan, and am trying to switch from TMK to QMK. I want my enter key to be enter when pressed, and momentarily turn on layer 1 when held. I want the same for space but layer 2. I am able to do this on the http://minivan.config.thevankeyboards.com/ which uses TMK and have to assume it is possible to do on QMK, but honestly am not positive.

It seems MT() only allows for traditional modifiers and modifier combos and your site. Is there a way to expand that to include momentary layers?

[ExperimentsWithCode]

I am dumb, and apparently can't read good.

The code I was looking for is LT()