In that case there is a quite simple fix.
Keep the land borders shut and only allow foriegn entry from international flights.
Of course it will not happen though,
as rich, greedy Thai industry will say they are pushing for tourists, but really just want slave labour Burmese to make them that much richer.
Its not just Thailand either.
The most paranoid country on earth, Australia, will not even allow there OWN citizens back in the country unhindered, yet are now considering special visas for cheap migrant labour to help greedy industries bottom line.
Disgusting.