Startup IDPs only league

I’ve been thinking about starting a league where only defensive players are drafted and started, sort of like the inverse of what we normally do. Does anyone have any thoughts on this. I’ve never been in a league with any IDPs and in a perfect world the other managers are also inexperienced with this kind of thing as well so we can all learn together. I’d probably make it free to play, at least for the first year while we all figure it out. Would this kind of thing interest anyone?