I withdraw money from any atm with my Aussie debit card as needed. Don’t pay fees other than visa exchange rates which are the best rates you can get. One thing that’s recently changed is that now I have to pay the Thai banks atm fee
I see you said "not big things", but my experience might help anyway. I paid under 500K Baht (including customs clearance for 12K) for a 20 foot container load of stuff worth much much more than 500K. Very simple and efficient process with OSS worldwide movers.
Because foreigners appear to love jumping off balconies. There's been a few in past months. So basically, you can't be trusted to do the right thing. Maybe just suck it up if you're desperate enough to travel during a pandemic.