well being lenient would allow you to change inside the country vs saying no and you having to leave. Yes it may take some work on your part to do, but not having to leave then quarantine on your way back in is being very lenient IMO
I’d say any! When I went to Muang thong Thani they didn’t ask for a TM-30 or proof of where I was staying. So I could be from anywhere.
However you have to go to an immigration office that is doing these extensions. Ie in bangkok you have to go to muang thong Thani you cannot go to chaeng wattana.