Pretty sure it’ll take a drastic redesign to let the whole keycap circle fit in there: I think it may interfere with the switchplate and/or click leaf.
I think that was concluded in an earlier thread.
I think that if the switch was widened to fit a Cherry MX key stem then its feel could be adversely affected.
There are lots more different vintage Alps-compatible keycaps out there than vintage Cherry MX.
Personally, I think it would have been better if Cherry MX had transitioned to using Alps' keycap mount which was a more dominant standard at one time - then all modern replacement sets would already have been compatible with Matias.
Plus, with Alps it is possible to make 75% keycaps like Matias uses in the Ergo Pro and which were planned for the 60% keyboard.
I guess it would require a case redesign with more space for the slider + keycap stem. If I'm not mistaken, the mechanisms reside either side of the stem, so this should be feasible without changing any of the parts of the mechanism itself, just the case and slider design. Anyway, I think it's worth investigating at least, since keycap availability is a definite factor in many people's decision on which mechanical board to get. Not being able to put your favourite caps on a board sucks. Not to mention
I have yet to see an Alps mount caps set that I REALLY like.
I'm interested in the switches, but not enough to buy a board that I can't change the caps on. I know that it is POSSIBLE to change the caps, but there aren't a lot of easily available options, let alone any that truly appeal to me. And keycaps are the interface between my fingers and the computer. They're important.
MX is the current standard. I mean, SP can and do make Alps mount caps and I know Matias is working on producing Alps mount sets to sell, but I have so far seen only one GB for Alps caps. How many MX keycap GB's are there? I don't think there's enough interest for producing anywhere near the variety we see in the MX caps market. And why split the market like that anyway if it's not really going to increase sales of your product.
IMHO, making MX keycap compatible switches will increase Matias' sales far more than making a few sets of their own keycaps.
There's a place for proprietary components and a place for standardised ones. IMHO, components that differentiate your product and make it unique should remain proprietary, but when it comes to interfaces, standardisation is king, whether it's an electronic connector (like MicroUSB) or a keyswitch stem. It gives the user options and users like to have options (as long as it's something at least some users would really want to do and it doesn't interfere with the primary functions of the product). They like to know that they CAN do a particular thing with the product even if they never actually do that thing.