Can I submit my 90-day report a week early when applying for a NON-O extension in Thailand?

I have just done mine 10 days early in Chiang Mai. Extremely easy. No TM30 needed, just form and passport.

When did you return your 90 day re sets when you return

If I was a betting man I'd bet they will say NOPE and then tell you that you can do a report in person from 2 weeks before the due date until 1 week after the due date.

As Ellie said, all you can do is ask, you're out nothing by doing it 🙂

Remember the 90 day reporting room at Chaengwattana moved up one floor to it's own separate room (so on the 3rd floor). They do resident certificates, TM30's and 90 day reporting up in that room now.

apply for your 12-months extension as soon as possible, do not wait. If Immigration want one or more documents on top, you need time to collect them. You don't lose any single day of the new extension when you go earlier

You may or may not be able to submit 90-day report a week earlier. Sure you can try and nothing to lose by trying to do 90-day report with your extension. The worst thing they say would be "no, come back next week".