Honestly they could solve all item/room issues by putting all items from the deleted ship in collection storage(just give the item for music used). You could also give out casino coin passes for the coins. Alliances they could make them transfer and called team name (ship3) ect. IDK how you would handle ppl already in one. Friends I would think you could just transfer since the ID exists still on every ship? / they are being moved too. Might create chaos at the time but long term might be good. lookbook(who cares?) and teams would prob be the hardest IMO.
EDIT sega is lazy and will never do this though so idk