You could take the chain and front sprocket off.
Maybe the bigger issue is finding a mechanic you trust not to joy ride it. The engine will need to be ran after those repairs to make sure everything's in operating order and there's no leaks.
If I had a nice sport trike, I'd try to find proper insurance for it to cover things like theft and vandalism/damage at it's true market value. It is a vintage/classic/antique vehicle, whatever banner it can be insured under.
The story of three wheels and a man...