Hi there, I'm Hossein from Iran.
Why don't you develop RTL version of Bootstrap?
There is a lot of websites that use Bootstrap but they make it RTL theme selfs.
When they make it RTL, there will be a lot of problems.

If you have problems with Iran, develop it for Arab countries (or any RTL language country) which you have no problem.

Please, release the RTL version of Bootstrap in v4.

Regards.