That's really not doable given Bali's location and how many foreigners are there. It's not like Aceh or Papua at the ends of the country with very few foreigners to manage.Not going to be easy, but 'bisa' .. the governor of Bali needs to come up with some policy or measure, that's why he is looking at Bhutan. My advice .. steal the good ideas. Maybe "visa khusus Bali (VKB)" .. extra "kerja untuk imigrasi" ...
Anyway the governor will soon enough realize if he hasn't already that such a plan isn't feasible economically either. What would they do with all the empty plebian tourist infrastructure and the unemployed?
For years they've tried to boost tourist numbers, culture and environment be damned, to get the monero. There's way too much at stake financially to abruptly put up fences.