The tweak I used NEVER involved multiplayer, though? It just involved tweaking a save file variable to allow a larger party. It's this one: https://www.nexusmods.com/baldursgate3/mods/181?tab=description Also, "changing method" doesn't really fit my needs, since the idea was playing with all the currently available companions in party like I did in the past, not with mute custom droids.
Very glad we can mod a larger party without using MP/player-created characters. If having a bigger party is only possible by using empty-suit created characters, that would be counterproductive and pointless.