nobody is going straight to the point. Thailand is highly corrupted, if you get the cop that sees u doing your house work and he decides that you need to bribe him, then u got no chances besides of that. The same goes if a jealous neighbor calls the cops reporting u were working. Technically you can do gardening and minor house work but in practice, if it's a bad day you might end up in jail with cops telling u how much u need to pay otherwise they'll kick u out of the country. That obviously happens more often in touristic places but I know a few guys around udon thani e khon kaen that got into this sort of issues...
I know some folks and they've been doing that since they've opened for covid (out every 3 months) and never got an issue. People cannot say this but I've heard there are helpers at the airport that will help you get through the passport check for a small fee if u got that apec card....
don't buy anything under 10k. If you can get a second hand samsung s22/a52 then it'd work. Anything cheaper than that is going to be obsolete and slow in a year or so