Since it seems like Alps sets are stupid hard to get made, I decided to see if it would be possible to make some MX to Alps converters and, if viable, produce them affordably. Since Alps stabilizer wire can fit into Costar stabilizers, they should theoretically let you use Costar stabs on MX caps and use MX caps on Alps switches. The main issue is that you'll want to use lower profile caps.
To see if it's even viable, I've gone ahead and ordered several models from Shapeways in a variety of materials to see if any of them work better as a master than others.
If that works out, I plan getting another model made up that's more suitable for molding and casting (sorry for the tiny pic):
Alps stems are something I've been thing about for a while now since they also seem like the perfect stepping point for a modular stem system. If you do Alps stems, you could also make snap on MX and Topre stems, making it cheaper and easier to produce a cap or caps that work on multiple platforms. There aren't a ton of Alps caps out there, so it's less important for cap sets and more of an interesting project for novelty caps.