Is it possible to extend my Thai visa for another 30 days after my first extension?

>Please confirm it is possible

In theory, it is. You can get an unlimited amount of letters from the embassy, submit it, and you'll get a 30 day extension to the amnesty for 1,900 THB.

>if so could I go next week to get this done

To get this done, you'll need to get a new letter from your embassy. As of right now, all embassies that are issuing the letters are dated up to September 26. You'll need to contact your embassy on Monday, and ask them. Once you get the letter, you'll have to submit it to immigration, and having the letter does not grant the extension automatically.

From what I understand, if at the end of October you still cannot fly home and you can get another embassy letter then you pay another 1,900 Baht for another 30 days, and so on until Immigration say otherwise. Good luck!

Frankly I think it doubtful you will obtain another 30 day extension.

Those on amnesty already have had six months in Thailand...

Now one added month with Embassy letter.

Be prepared to obtain a correct visa to stay or a Plan B to leave at end of your new 30 days.

Good Luck.