My inclination is to always give something a chance. I wouldn't be a good landscape pro. I'd care for them with basic measures and see what they want to do. I don't think you will have all the options you would normally have with a new tree, but they may turn out to be attractive, in spite of the abuse. Just offhand, I would think in terms of encouraging them to put their efforts into bushing out, rather than growing up. I say thing because they look like things that I've seen eventually getting upwardly sprouty not likely to ever establish a taller main trunk. And to look good, they need the lower density. My gut instinct is to forego the usual impulses to prune the lower things that look like water shoots. In fact, I wouldn't prune them at all for a long time. They likely have more than enough root to support the limited foliage they're now capable of producing. They may end up a part of a full, bushy specimen. But I think they will give you some guidance themselves.