French people don’t get a visa on arrival and if someone did get one on arrival it wouldn’t last 30 days but barring that there aren’t any issues with the visa exempt entries that you have described.
, as someone who runs out of talent quite often in a motocross bike, it’s been cheaper to get fixed up in Thailand than paying to park at the hospital in the UK!
i don’t know what a gite is but I do know what retirement is, which is the act of leaving one’s job and ceasing to work. So no, in Thailand, you can’t!