I agree that it would be difficult to convince SNK that producing more cartridges could be profitable; primarily because we ourselves don't even believe it. However, rebranding cartridges could probably be arranged. It would have to be through a central source, like say Shawn at the neo store, but surely SNK could make productions of "English art kits" for games like the Real Bout Fatal Furies, the Last Blades, Voltage Fighter, Ninja Masters, Big Tournament Golf, etc. (games that are rare & expensive in USA format, but more common & affordable in Japan format.) Shawn takes "pre-orders" of say a minimum of 100 each of these art packs from us, then orders them from SNK.
It's not like SNK didn't already do this with him once before. And heck, do the same with MVS carts too. Imagine being able to pay $10 or even $20 (who cares right?) for an absolutely mint condition bran new peel away SNK authentic MVS cart sticker of USA Pulstar or Last Blade 2 to replace over your worn out crappy condition Japanese ripped and torn label.