Yes I do this every month , I transfer in London from my uk accounts to BKK bank in London to then it automatically transfers to my BKK bank in Pattaya , 24hours 👍🏻
If your in the uk , why not apply at the Thai embassy , London , easy, I did mine there 5 years ago . Go to their web site and follow the requirements.
55k bht income , from where ? . I mean is that coming via transfer from the uk for example , ? Because that exchange rate could and will change , for better or Worse . Would you have purchased property already ? . Because you’ll need to factor in rental and bills for example .
And regards obtaining the long stay 0-A ( pension) visa , you’ll need to show financial records and apply at the Thai embassy . You do Not need 800k bht in your first year , only when you apply for your first extension, and that’s needs to be in a thai bank for 3 months prior ,and every year there after.
Phuket is also more expensive I’ve found then up country . Imo 55k a month is not a lot to live on , IF you still have to outlay For rent etc .