Prevent removing himself from region owners if there are no other owners left

[molor]

Is your feature request related to a problem? Please describe.

Yes, I have max-region-count-per-player: 4 but player claims a region, adds himself to member list of it, then removes himself from owner list and then creates 5, 6, 7... and more regions in total.

Describe the solution you'd like

Add a permission like worldguard.region.removeowner.self that allows removing himself from regions IF no other owners are left in it, otherwise show error message e.g. You can't remove yourself from this region because there are no other owners!.

Describe alternatives you've considered

Remove access to remove owner command from players?..

Additional context