you asked if you could fill in another visa. Yes you can apply for a visa. Check how long the on line visa application will take for the embassy you're applying at.
Or enter visa exempt for 60 days, depends on passport.
No, you never filled in an online travel info form before because it only starts on may 1st. We used to fill in a little landing card on the plane years ago. Now you do that info online in the 3 days before you arrive. So day
why would you freak out over filling in a form. People book flights on line, buy stuff on line, but become freaked out over putting travel info on an online form.
if you are wanting a bank account you can apply for the non O in your home country and then arrive and open a bank account. After that apply for 12 month extension on retirement basis. But buying a property doesn't require Thai bank account or visa as far as I know.