I kinda like your plan, assuming that the bike is mechanically and structurally sound, and that your balance on an almost-too-long bike is ok.

Get some nice squishy slicks, the widest that you can find, and figure out a tire pressure that lets you roll without pinch-flatting but isn't rock-hard either. Don't worry about speed or rolling resistance for now- that can come later.

So happy that you're allowed to ride again!!