Non oa visa initial application fund can be in your home country bank account, but check the embassy for how long funds needed to be in account before applying.
i do not remember if they asked, but i had all my application paper with me going thru immigration. If your insurance expire on dec 31 2025 than you will only be stamped until your insurance expire, so not 1 full year. I also lost 2 months when initially entered due to insurance.
So what you can do, before your stamp expire buy new insurance for 1 yr in Thailand, leave Thailand - go vacation somewhere close ie Singapore, Malaysia...etc. once you come back provided the same visa and new insurance to immigration. They will stamp you for another year the expiration date of yr new insurance.
When i arrived with my OA visa, i just show custom officer the print out of the Visa and Passports. Make sure the officer know its a 1 yrs OA visa and stamp you in for 1 yr or the expiration of yr health insurance (if yr insurance runs out before the visa) before leaving.
but i had to really took blood test for all the listed disease. Maybe you can change doctor, even out of pocket the cost should not be too much ( i hope).