Hi guys! You may know me as the maker of Keymacs keyboard kits. In the last year I have put a lot of effort into improving my keycap manufacturing technique and as a by-product, I have come with a new manufacturing video:
It shows how to convert an existing MX-mount keycap to Alps. The procedure can also be used to make thicker versions of MX switches or repair broken stems. If you have a small desktop CNC and enough of time and patience, you may want to try it. 