They didn't mean renew your non-OA, they meant get an extension. You could only renew it in Canada.
Your best option is to leave Thailand and kill off the OA. You can re-enter exempt or better apply for a single non-O e-visa in a nearby country, then re-enter, 90 day entry. Then you only have to get a 12 month extension of that. You will need 800k in your Thai bank account, but you will no longer need the insurance, not at least for immigration purposes.