So my options would be :
Go with the vista exempt, try to open bank account, if not successful try to talk to a visa agent from Pattaya or Bkk if cannot find one in Samui (the branch shouldn't matter, I will stop for a few days in BKK to buy a car and do marriage docs before heading to Samui anyway).
Extend this until I can get the money in the thai bank and then try to change this visa exempt to a Non-O for marriage at Samui or Surat Thani office (i have been there before while living in Samui and they told me to not come back, go deal with Samui immigration, after giving me the extension or what was that i needed back then).
If not possible go to Penang and get a Non O from there and extend it yearly in Samui. They used to give 1 year Non O based on marriage some years back, not sure if that is still the case. I will have the money to show so it should be no problem.
Marriage certificate should not be a problem, i will do everything that needs to be done about it here(translate, legalize, get the embassy stamp, etc) before i leave and give it to translator in Bkk to do the rest of the stuff. I will also make an appointment to Romanian embassy in BKK for when i will be there.
Many thanks for the help in this thread, it is of enormous use. I will report back with my journey maybe i can also help others.