Effectively, no.
There are millions upon millions of Thais who regard working as crew as a very prestigious job. Every time a Thai airline recruits crew they have literally hundreds of thousands of applications. So there would be absolutely no need or reason for a Thai airline to go to all the trouble of procuring the proper paperwork for a Thai-speaking foreigner to work for them.
Even the non-prohibited jobs are virtually impossible to get for foreigners - that's why most of the no-hopers who go over there for the pretty girls (or boys) end up as English teachers in some dump.