I can only speak for myself but I have been using transfer wise funds for my last three marriage extensions without any problems.
When the Consulate stopped issuing income certs I went to my local Immigration Office and asked them what they required, 400K in the Bank was the reply.
I had read all the information on TV especially that posted by Ubon Joe so I acted confused and asked was the information I had wrong, my I O pulled out a thick book and leafed through it , made a phone call and then said O K , 40K a month from overseas.
I went to bank and obtained twelve month statement and looked at the codes applied to transfer wise , these were marked MCL00001, nobody in the Bank could tell me the meaning of this so back on TV, another poster had queried this with Kasikorn and it turns out that it denotes funds transferred by API system which is funds from external source.
I presented my IO with a single sheet summary of transfers, copy of bank statement with transfers neatly underlined, copy of bankbook pages and note referring to bank codes. This has been accepted without question for my last three extensions, no requirement for PDF copies or individual Bank letters apart from the usual covering letter.
My advice would be to approach your Immigration Office and try to get someone to listen , reading the reports from many posters it seems a futile exercise but you will never know until you try it.
So very thankful I live where I do...