Long time project: Favorit Pursuit.

Not permanently, just use some tape if you don't have proper covers.

Anyway, if you don't have a lockring or brakes, is it safe to assume you live in a remote area with straight roads?

Or I'll change the front tube to one that doesn't leak.

Well I guess you could say that haha. But I've ridden it in Malmö (3rd biggest city in Sweden) and that was no problem. Used some loctite and my crazy nordic viking strength when I mounted the adaptor. Hopefully it'll hold up for some years.