Those jobs are all reserved for Thais, paid or not it's considered work. If you have kids with here then it would be possible but otherwise nothing until marriage.
No such thing as a covid tourist visa, presumably you're currently here on an unable to travel due to covid extension?
In answer to your question, it depends very much on whatever immigration office you'll be using and your future employer. It requires more paperwork to do in country and not all employers can provide it, hence a fair few still tell people to apply from overseas.