OR... You could just make a Free Company, invite your alternate characters to it and level it up to Rank 4 so you can purchase housing. Though personally... I think if you're gonna do that, I would just settle for a small or medium house than a large. Not that you don't have any less right to own a large house though. I just think Free Companies who are actually trying to grow a community deserve the bigger plots. In any case, that's what you can do if you're willing to do it. However, do keep in mind that the best way to level up a Free Company would be to do your Duty Roulette and spam FATEs for days...