if we stick with alps-mount for the stabilizers, the only option we have is to source stabilizers from matias. the positives of doing this is that we could also source caps from matias, which would likely be slightly cheaper than custom runs of SP caps. however, matias has not made it clear whether he even has enough caps to sell them a la carte, and i'm hesitant to ask him to redirect more parts-inventory than he already has to us.
imo, there's such a paucity of good old-stock alps keys that i'd rather just have new keysets made with hybrid alps/MX mounting. costar stabilizers in MX-mount are easy and cheap to source via WASD, and it's possible that SP's tooling is modular enough that they could make runs of full MX and Alps/MX sets in quick succession without having to spend a lot of operator time messing around with tooling, so we might be able to mix alps/mx sets in with full mx production runs at a slight discount.
i believe matt3o said he's started inquiring about this with SP, so we'll probably have some answers soon..
one last thing to keep in mind is that PCB-mount stabilizers are _not_ an option with new-stock alps-style switches, as they have no purely mechanical fixation mechanism to the pcb like mx switches do. alps switches have to be plated, period.
eta: yes, i'm thinking larger-scale. if you only want to run off a few boards, go for it. at101ws are common enough that 5-10 one-offs could probably be built for not too much money. imo though, it's not worth the effort to do all the board design unless you can order and kit in volume.