I think we need to recognize that we won't be able to 1000% cover every obscure ALPS board.
We can address this in three ways:
* Stabilizers: Boards that are built to accomodate Costar Stabilizers can accept ALPS-stabilizer keycaps by using the wires and stabilizer inserts from a sacrificial ALPS-stabilized board like an junk-worthy AT101W or AEKII Boards that accept ALPS-style stabilizers, however, cannot go the other way-- the clips to hold the stabilizer wire on long keys are often too far apart to accept the Costar stabilizer wires.
To me, this means the best way to go is to focus on someone who can make ALPS-stabilized caps. This is probably Tai Hao more than Signature Plastics, to be frank.
* Keycap coverage. Yes, we're not going to get everyone, but we can pick sensible targets. If you start with an ANSI 104 layout with 1.25x modifiers, that covers AT101Ws, ABS M1s, KBP V60s, and Ducky 1008/1087XMs (assuming they do the stabilizer mod mentioned above). A 1.5-1-1.5-7-1.5-1-1.5 bottom row will cover Matias, Omnikey 101s, AT101s, and plenty of other vintage ANSI 101-layout boards.
The moment you bring in trying to support a big-ass enter, it dramatically complicates the whole situation. No two are laid out quite the same. But if we can cover those "mainstream ANSI 101 and 104" boards, we can satisfy a lot of people. Most people-- even ALPS fans-- aren't wedded to specific bigass layout boards, especially now that there are a lot of switch-swap services out there
* Finally, for those people who can't compromise, but might want to participate, let's look at tame "compatible" colours. I had doubleshots from a Focus 2001 on my board for a while; the layout missed a few keys, but the plain colours blended tolerably with the original lasered crapcaps. By starting with a colour selection that's neutral and non-aggressive, it can be successfully mixed with existing keycaps without creating unicorn vomit.
