So if you do your TM30 online you just reprint the one last used (if within 7 days of creation) or create a new one when required. In the future download and save the PDF not just print it ;)
Your choice of insurance to meet the Non-OA will be very limited and maybe not meeting your needs fully so consider the Non-O and choose the best insurance to suit your needs.
I was at the DLT in Sa Kaeo with all of those and out of there driving away after 1 hour 25 minutes so, as with everything in Thailand, it depends on the province