What are the best options for my parents applying for a retirement visa in Thailand from France?

I feel for your parents needing to deal with the Paris Thai Embassy.

1) it is E visa application only

2) They are the worst people in the world to deal with. At one time, the French would travel to London in order to swerve the Paris Thai Embassy. That is no longer possible due to Evisa.

The denial rate there, particularly for METV is high. They want exactly what they want. They won't be fobbed off with anything less.

3) Good luck getting any European based insurance company signing that certificate. They just wont sign and stamp anything issued outside of the company.

Simply put, enter Thailand on tourist visa, go to immigration here, apply for non-o, open bank account, deposit the funds, $800,000, then at end of 3 month non-o, apply for extension of stay, 365 days, for purpose of retirement. After 1 year, you can bypass 800,000 deposit if you have consistant 65,000 per month each from home country to Thai bank account. It is not too conplicated once you get the 1st 365 day extension of stay.

why not tell them to get a Non O based on over 50 then no need for insurance?

Does there French insurance cover them globally? France only (or EU only) isn't good enough.

Whats the issue with getting your home insurance company to complete the silly form? Is this being refused? Obviously the directors signature isnt gonna happen, but how would that be checked anyway..? Get a helpdesk agent to fill it in, and their direct boss - doesnt seem too hard 🤷‍♂️

I'm guessing is to contact the insurance provides, get a quote, and buy the insurance. Doing 90 day border bounces on a non-o may be difficult at that age

best way is to get an insurance, hospitals, doctors etc in Thailand are not free of charge. Alternative is the Non Immigrant O visa, they get 90 days of stay on entry. If they wish to stay longer they can apply for an 1 year Extension of Stay but then the need to meet the requirements set by Immigration