Took me a while to figure out how to make him a playable avatar, at first I thought it was impossible since he is missing so many things an avatar should have, but as I kept messing around with the files I found out that it was actually possible. Surprisingly, he functions much better than I thought he would, even has animations when turning around (something none of the avatars have). Had to delete the Ormagoden Axe and the Tenacious D guitar as they were messing up his animations in multiplayer (single player worked fine for some reason, this part drove me nuts until I realized those two weapons were the ones causing him to glitch lol. Good thing I didn't have them equipped in single player, otherwise I would've never found out about the cause). He only has 3 solos though (Buff, Face Melter, Fan Tribute), and like you said no cooldowns on attacks, but even at that state he is a pretty fun character to play as.
Thank you! Although I'm not actively playing Brutal Legend nowadays, just wanted to check out the modding aspect of it, I'll make sure to join!