I doubt if a hospital visit once a year will qualify for DTV, that also can easily be done on visa exempt, so there is a risk your application will be rejected.
It looks like you are advising people to ignore rules everywhere.
That is bad advice and also against the rules of this facebook group, but I guess you also want to ignore those rules.
TM47 is just an obligation, you can be fined when visiting an immigration office, but also in case you get involved with police for some reason.
Allthough the TM47 might look useless, it just is a rule of the country where you are a guest and guests should behave themselves and not ignore every rule like you want.
Anonieme deelnemer 808 At the border it will be no problem, it might be lead to a fine the next time you have to visit an immigration office for some reason.
When you have a visa the return or onward ticket should not be checked by airlines.
The airline checks are necessary for visa exempt because Thai authorities did not check these passengers, for visa holders necessary checks are done by embassy.
When you fully comply with visa requirements in country extension might not be too difficult.
When you don't comply with visa requirements you won't get an extension of course, then the border bounce only will give a small chance you get caught.