I'm actually going in this direction in my main save. I'm keeping it as a small village roughly based on Scotland, northern England or Ireland. It will probably be the site of a boarding school. I was originally going to put that in Brindleton Bay but I think Glimmerbrook is a better setting, much smaller and more intimate. It sounds like I'll need to tweak the bar.
The sims who live there will hear rumors about a hidden place and about magic. Spellcasters will be stories for children referred to by a name in the local language. Any extra lots will be part of the small village. I am keeping Forgotten Hollow as a vampire den though.
Anyway, it gives me more space in other worlds and opens up more that I can do. The school might take up the two spellcaster houses. I'm playing a university household but I'll get to that.
At some point, I probably will play with a spellcaster but maybe in a separate save unless some special child in my game is really suited to it. I don't want my other sims to become spellcasters. I'm looking forward to adapting Glimmerbrook.