If you're in France, why would they accept USD statements? That's ridiculous! If they're not going to accept AUD statements they shouldn't be accepting other foreign currencies either. No one accepts USD in France anyway.
Extend your Cambodian visa! Another option is, cross into Thailand or another country come back to Cambodia with an E category visa, extend that for 6 months and then you'll have plenty of time to apply for your DTV without worrying about your Cambodian visa expiring.
Many times I've entered Thailand where they don't see my visa and incorrectly enter me on visa exempt. I check my stamp and tell them to correct it. It even happens when I put my visa number down on the TM6 form. I wonder whether the new digital form will keep better track.
I therefore assume they can't see the visa on their system unless they notice it in your passport or you hand them the paper in the case of e-visas. I understand extensions of stay are visible in the immigration system because they're issued inside the country.
Quite clearly, when you leave the country by AIR you can do a switch. I am assuming wherever you are going to next will be by flight. If so, then you can do a switch. Makes zero sense to enter Thailand on visa exempt now.
Only people like me who drive to neighboring countries with their own cars would need to use the same passport for entering the next country as all stamps need to go in the same passport when you cross from one country to the next.
One or two reports of DTV holders being affected as well. Apparently if you're married to a Thai then you get to keep your account and there are other circumstances as well. Best is to lay low. Unless contacted by your bank, no need to do anything.