Actually looking to do something similar! I don't have huge funds but wanted to build the all purpose skate. Currently I have Bauer Vapor X2.7 with True Holders (V1) so I could swap between goalie and player steel in the same skate. I just found a deal on some 9035s and pulled the trigger. 10D/R in both skates, but the Vapor seems to have more room in the to box, where I may be brushing the toe box in the grafs. The grafs feel amazing every else but there for me at the moment. I have only tried them on a few times for a couple minutes and would like to have them on my feet for a bit longer with my sidas insoles before I put the work into the holder swap. I've also noticed that the Grafs seem to have a slightly higher/more supported ankle, but still great forward flexion for your stance. Graf always put outsoles on their goalie skates just like a player skate, so I don't see why you couldn't put a holder on them. If I move ahead with the project I'll upload some pictures. Hope this helps!