This may not be possible, buuuut. Valk's trance terra sprite seems to use one of altimas slots. But I'd rather use this in an event without dicking up the final battle. There are sprites that i just flat haven't noticed in game, 40 yr old man, 20 yr old man, etc. But they're smaller than the trance terra sheet.
Is there a way to nuke a few of these that are beside each other and apply the sprite there? I'd imagine you'd have to change the memory location pointer for the next sprite in the list to not fuck everything after the terra sprite up, but I'm not sure if even that is feasible. Is this something that can be done?
Does importing over another slot and changing the SHP and SEQ to ARUTE (Altima 1) or KANZEN (Altima 2) not work?