Some thoughts if this is to be done officially:
different switches:
Will there be different versions, or a bigger version with rows of all switches, or a pack with included switches (and a guide on how to solder, hue), or all of these?
other modes:
Will they be ignored and only 2-key-pads be made? Or maybe at least 4 keys, so you can play CtB, 4k and Taiko on it and buy a second one if you want to play 8k?
difficulties:
- They have to have a good standing on the table, if they're unstable it would be horrible
- The price still has to be acceptable of course. If it comes closer to a full keyboard, then the pad has to have it's own merits (besides being transportable)
I'd buy around 1-3 depending on what it ends up as and on the top of my head I can think of one or two more people who might be interested. Please do not give up on making something like this!