MK2S ramps 1.6 swap - FW - what way to go?

Hello, I’m going to swap the rambo for a ramps 1.6… because silence… (Also I’m building a kind of MK2S bigger clone so I would like to use mostly same stuff)
And I hope to use 12864 full graphic LCD…
Is there some usable FW out there?
If not - Should I:
a) modify original prusa FW?
or b) set custom marlin?

Aaaand I’ll like to use MK3S filament switch…
Thanks for advice. :slight_smile: