The problem with having an anti-leveraged buyout clause is you instantly make every club realistically less valuable as the cost of most of these 'assets' now are at a level where they're realistically only affordable by borrowing. State ownership aside. Outside of that even people with on paper net worths the far exceed the valuation of a football club, will not actually have the money to pay for the club outright.
Even Musk has never had £5bn sitting around in the bank.
I don’t think there is such a clause though?