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I use a very simple rule for detrmining what's an Ultima variant or not: if the author calls it an Ultima variant, it is; if not, it isn't. So The Game of Nemoroth and my game Interweave are not Ultima variants since they don't call themselves that (although Interweave describes itself has being sort of Ultima-like).

Examining this site and The Encyclopedia of Chess Variants, I find the following Ultima Variants:

• Bogart's Chess, which replaces a Chameleon and a Long Leaper with an Absorber (which picks up the capture method of each piece it captures) and a Golem, which only moves two but has to be captured twice (this was the inspiration for Golem Chess).
• Renaissance, which is played on a 9x9 board, and adds a Pusher, a Puller, a Resurrector, and a Bomb, and has a limited form of drops of captured pieces (using the Resurrector).
• Stupid, where each piece can move like an Ultima piece and an Orthochess piece.
• Ulti-Matem, except the Pawns have the moves of the Orthochess pieces they would be standing in front of, except for the King's Pawn which is a Double Knight Pawn which makes two Knight's moves in a row in any pattern.
• Ultimate Ultima which you described in this comment system here.
• Unorthodox Ultima, in which a Long Leaper and a Chameleon are replaced by a Neutalizer (which removes the ability to capture of adjacent pieces) and a Repeller which forces an opposing piece moved next to move as far away as possible.

So look at them. All of them at the very least add some additional types of pieces. All of them are more complex than Ultima. Although, no one has take the simple, logical, and completely insane step of combining Ultima and Chessgi/Shogi. Ultigi! Ultima with drops! Ah, maybe not.