Thanks for your willingness to help.
I'm not that good in electonic, so I might need help on the plans on that front, along with what resistors or diods I need. (I do know how to solder &, at worst, know someone who can help on that part IRL.)
For the design part, I have found somone else's project I can use as a base, and have switches and some keycaps I might be able tu re-use, but might very well need help with QMK and what micro-controler to use.
I effectively don't care if the spacebar is split, nor if it is 1u tall instead of 1.25.
All this is interesting info I will-have to study. Thank you.