That would actually be the easiest way to implement it. I would love to hear from the Buildteam guys if they implemented something like this. I would jump on that opportunity immediately.
I wonder if you still organize leases. I would love to pick up a delegation to curate the Sports community and hopefully turn a profit/grow my HP at the end of the lease contract.
Yeah it might be worth joining their Discord server (I imagine they have one) and seeing if they can add it. Can't imagine it being too difficult to add a little check box to "private lease" - although I'm not a coder so have no idea haha!
I've pretty much leased out or delegated all my HP otherwise I'd help you out there man. I know @acidyo and OCD are looking to help support with specific communities so you might be able to reach out to him?