Wevo and Guard helped my buddy cstreit with his pesky 3rd gear problem on the 915. They joined forces and put together a 3-4 setup that solved his exploding 3rd gear problem. You can hear the clashing a bit on 4th gear downshifts
MotoDelta Motorsports at BHF - YouTube
NASA GTS at Road America - Chris Streit #15 Porsche - YouTube
http://forums.pelicanparts.com/porsche-autocross-track-racing/351652-dog-gear-conversion-my-915-a.html
I traded messages with Roger Brown at California Motorsports (CMS) about the Albins dog engagement kit not too long ago and he said Albins discontinued it due to lack of support from the market.
Matt Monson at Guard has been working on a 915 dog shift trans to update their previous design. Maybe inquire with him. I've still got that on my wish list.......