Hm, you're the second guy to ask for something similar in the past few days.
Anyway, since you're experienced with having a home server, how's about you rent a normal one? I'm fairly certain that there's a plenty of parents who'd like something like that. They might even toss in some coin if you ask them nicely. I sure would - if I had kids that is(working on it). And you know what? It might even be fun. You could give 'em challenges and such, see them overcome the obstacles
.
Like for example, I was greviously bored while filling my wither soul shard, so I went creative mode on the fort I was filling it in. Added ammo boxes, health spawners, and areal faith plates. It was great! You could do that.