they don't have to get round hundreds of countries laws, just the EU and UK.It won’t buy you past employment laws and anti competition laws in hundreds of countries simultaneously
And to be honest, I'd say it's probably not difficult to regulate wages in a league which select clubs are members of.
The salary cap would be so high that most other countries leagues/teams couldn't come near it.
Also, players would make an absolute fortune in person appearance/endorsements/image rights.
The only way you stop this is through UEFA and the member teams FA's. All these organizations can be bought.