Technically, the Hungarians have the Re-2000, Cr-42 and the Bf-109, so there ARE Hungarian fighters in the game, just not any locally-produced ones.
I'd argue that the WM.23 is actually just a development of the He-112, which the Hungarians also used (along with the Spanish and Bulgarians). Model the He-112 and you've got 3/4th of the model for the WM.23, since only the fuselage changes and that's the easiest part of the plane to model.
I've played around with modeling the He-112, but my modeling skills aren't good enough to produce anything I'm satisfied with. The guns and exhaust manifolds make the He-112 very tricky to model while still looking good with a relatively low-poly model. I've probably built and discarded four models of the He-112 just because I wasn't satisfied with the way that the nose looked. Definitely the wrong project for a beginning modder!
While the WM.23 would be simpler to model than the He-112 the problem is that since it was an experimental plane built by a country on the losing side of the war, there's very little data on it: no flight data, no cockpit photos, no blueprints or cross sectional views, no pictures of the plane in disrepair or disassembled in order to get a sense of what end cap and or damage textures should look like. I'd love to see this plane flying in the game, and perhaps be the one to make it fly, but it would require a very skilled modder to make it work, and, arguably, it should be included as part of a larger He-112 pack.