If you need to show money transferred to Thailand for Extensions of Stay I would say do it yourself so that you can ensure that it shows as an international transfer and goes through monthly
As the funds will not be seasoned for the required 3 months (have you checked that your Immigration Office that they require 3 calendar months not 90 days?) will they allow you to apply for a new Non_O which only requires seasoning of 30 days?
The only short-term extension that might be available is the 60 day Visit Thai Family if you have a Thai wife or child. If not then it's a 12 month extension or a border bounce assuming you qualify for a Visa Exempt 60 day entry stamp.