McDoogleTex's new ADA keycaps for the Kodachi may also fit the Yoda. But this has to be a common problem for any trackpoint keyboard. Cap options are also limited for the EnduraPro.
A complete solution would probably include (1) drill press jig to correctly orient the G-H-B caps, (2) correctly sized bit(s), (3) set of trackpoint stems of different lengths. And I'm sure that machining plastic (especially ABS) would require some special techniques to avoid cracking.
McDoogleI know I'm super late here, but I just wanted to say that if you can assemble and solder a keyboard, you can definitely grind down keycaps to fit around the trackpoint. I did this with a dremel and it took about 5 minutes, and then another few minutes later on to tweak so that nothing rubs the trackpoint cap. Just do a test grind on a keycap you don't need before attacking the G/H/B keys. The cutouts aren't very pretty, but you can't see them once the keycaps are in place.