I've successfully converted also King of Fighters NeoWave!!
Unfortunately, has the same problem as Metal Slug 6 and shows black screen on real Naomi but works great on MAME.
Hopefully the problem/protection that is causing this is the same in both games, and even with more luck the same one that is causing the games not to works on Naomi 2.
With the Naomi Development kit I could do a lot more and faster....if someone heard from someone where it could be downloaded please PM at the neogeo forum.
Stay tuned for more.