Why do you need to process another visa? U can stay on your visa until u get another work permit so just wait for your husband's company to hurry up with the work permit. Unfortunately for foreigners working here some companies take their time
I do know maisai border open always but wasn't sure because of songkran festival. I'm on a none o multiple entry due 18 April so I always like to go late as possible
I'm also from UK and working here teaching English on a non o multiple entry based on marriage. I might be keen teaching online in the future but most companies want American teachers, not British.