There's this IPS LCD screen with capacitive touch which is about the same size as the PCB that could be used: http://www.lcdwiki.com/2.8inch_IPS_SPI_Module_ILI9341
I could find it on aliexpress for example: https://www.aliexpress.com/item/1005007127493651.html (untested)
This could be a replacement for the buttons, so there is no need to do bottom side assembly, just put a touchscreen there instead. The PCB will need some mounting holes to put screws and spacers to fix the screen in place.
There's this IPS LCD screen with capacitive touch which is about the same size as the PCB that could be used: http://www.lcdwiki.com/2.8inch_IPS_SPI_Module_ILI9341 I could find it on aliexpress for example: https://www.aliexpress.com/item/1005007127493651.html (untested) This could be a replacement for the buttons, so there is no need to do bottom side assembly, just put a touchscreen there instead. The PCB will need some mounting holes to put screws and spacers to fix the screen in place.