It’s not possible because the PUT balance usage is controlled by the vaults independently of the invitation.
Did you try my safe_vault fork for local network? I indicated that I have raised the limit up to 5_000_000 operations per account a few days ago.
The client binaries compatible with test 17 should be compatible with it. You can even use it as a global network by filling up “SAFE Browser.crust.config” with your own IP addresses.