at most offices you can come in free stamp 60 day entry, bank the 800K baht and apply for the 90 day Non-O visa in country for 2000baht. it goes under review for usually 2 weeks then you go back to get the Non-O visa and a new 90 day stamp inked in. Then 2 months later you apply for the yearly extension
it's not a hybrid anything, many MANY people do the in country Non-O. Although with the difficulty in opening a bank account free stamp it is often easier to get the Non-O in your country before you come here, so you can open the account and get the funds in
you need to update the bank book the day you apply for the extension (and if that means put money in or take money out to make the machine print the update with the balance and the date you apply that's what you have to do)
AND
You need the bank to print out a 3 month transaction detail report (even though it sounds like you don't have any transactions on that account)
You can apply for the year extension when you have 30 days or less left (so your date of after Jan 7th is correct)
You need to get the standard bank letter, the 3 month detail transaction history print out
AND
you need to update the bank book the day you apply at the immigration office (by putting in 100baht to the account so the passbook shows a transaction and updates that day)
Not to mention you need all the documents you used when you applied for the Non-O visa because the year extension is a completely new process, so passport copies, lease, TM30, landlord i/d etc, and the TM7 application for extension form
You can get the standard bank letter, and even the detail transaction report issued at any branch.
There is no obligation that you need to get it at the branch the account was opened at.
Although definitely check with the branch you're going to use, I've seen some branches reluctant to issue the paperwork (even though they certainly can)
The two consulates in Lao (Vientiane AND Savannakhet) have mandatory interview for DTV visa approval, that's what's been taking the time, they have a lag between when you apply, go pay in person, and when they contact you and tell you to come for the interview
More and more offices are following the "from 2 weeks before until 1 week BEFORE" rule for online applications <- meaning you have a one week window to apply online.
example your 90 day report is due Dec 18th, that means you can apply online from the 4th until the 11th (2 weeks before down until 1 week before)
people have been rejected outside that "window" at more and more offices, Also make sure you match the address EXACTLY with the TM30 you have filed because those two programs now cross check each other against passport/address
AND
remember the first time you go to report after comin' back into the country you have to do it in person (or by mail) before you can use the online 90 day reporting system
The "Arrival Thailand Date" you put the date of you most recently entered thailand (your most recent entry stamp date)
The "Stay Visa Expire" you put the date of your extension expiration (or if you're DTV or OA visa you put the date of your current entry stamp expiration date)