Don't forget from 1st October if your eligible for 30 days on arrival you will get 45 and can extend by 30 days (tbc), so maybe you'll not need the visa?
But you say departing airlines will deny boarding... So they should never get there to be sent home?
All i am saying is that it's a random thing that you may get asked to proved vaccination when you arrive and i have read if you can't you will have to take a test before entry...?