What is the process for extending my visa and converting to a one-year visa in Thailand after my exempt stamp expires?

Let's assume a 30-day extension on my exempt stamp is the way to go. I move into my condo rental beginning a 12 month lease on July 1st. But until then I will be in various Airbnb apartments and hotels. Should I wait until July 1st to be able to show the lease contract when I apply for a 30-day extension... I am guessing not because the 30-day extension migjt not require proof of residence.

So just to get the milestones and deadlines right for the multi month process of going from a 30-day exempt stamp extension to the goal of a converted 1 year extension for retirement over 50... I am thinking based on reading that I need to do the following.

I have lease for my condo signed on Saturday and my own passport with more than 6 months and the condo owners ID. I take that to Bangkok Bank at one of the branches mentioned in this group and open a Thai bank account. I transfer $25,000 us or 800,000 B from the u.s. to that Thai bank account so that it begins aging.

After that I go to immigration and get a 30-day extension on my exempt stamp witch expires July 9th. I am not sure which section of the Thai immigration Bangkok Bureau I go to for that.

I then wait X number of days... Not sure how many?... I make sure that I have the signed lease, the condo owners ID, the condo owners Blue Book and apply for a non-immigrant O 90-day Visa at section c 1 of the Bangkok immigration office.

Once I have the 90 day non o Visa, I wait until the bank deposit in the Thai Bank has been there at least 2 months and hopefully that would be 30 days before the 90-day Visa expires and then I would apply for a one-year extension conversion of that Visa.

Any thoughts on whether this is the correct approach and whether those timelines will work would be much appreciated.