What options are available for transporting a sick monk from Bangkok to Surin?

Hi. This falls under everything else but hoping for some advice.

My father in law is very unwell. He’s a monk and is currently staying at the hospital for monks in Bangkok for the last few months. His health is getting worse and he’d like to be moved to a hospital in his home town of Surin so that he can be near family. I’ve spoken to a hospital in Surin and they are able to accommodate him.

The only issue is transporting him from Bangkok to Surin. I’d drive him but he needs pretty frequent medical supervision. I’ve tried speaking to his current hospital and they are unable to transport him. I’ve tried looking for a private ambulance service or something similar that could transport him but no luck so far. Does anyone here know a company/service that could do transport him? Or does anyone know another option?

Thank you.