Why not just buy the blades that are meant to fit into it? I doubt Feathers would fit in there without some trimming, but it could possibly happen. Judging by the design, perhaps Dovo Shavette blades would fit as well? You may have to break out the pliers and snap something off of them too, but I'm not sure. I guess my only advice is to buy the ones that were made to fit your razor, unless you know for sure that the others will fit. You don't want to break anything on accident.

If you want a straight razor-quality shave, and don't want to break the bank, there is an excellent alternative that I read about and have done ever since. I use trimmed Feather Professional Super's in my 1940's Injector, which works great. It's a less costly alternative to buying the actual Artist Club razor. The whole setup will cost you about 10GBP for 20 FPS blades and an old-school Injector on eBay. I'd recommend purchasing the blades from classicshaving.com. The service is excellent, the prices are great, and you know that what you're getting is legit.