Last year the IO told my Thai wife she eould call and take photos using Line. It wasnt a problem as the regular visa office was absent. The regular guy had no problems and we were happy to comply.
Kota Bharu is great travel down on a Saturday apply on Sunday and back to Thailand on Monday afternoon. Check they work Sunday to Thursday closed Friday and Saturday Muslim work week
As you have a multi entry you need to leave Thailand. Look at a cheap air ticket to Malaysia.( Air Asia or Lion Air) down and back in 1 day unless you want to spend a couple of days down there.