guarda se LTR può andarti bene altrimenti fai un normale visto retirement lasciando 800k Baht in banca dopo essere arrivato con un visto preso dal sito del consolato thai che poi convertirai
elite permanent non esiste più, ti consiglio di valutare LTR visa che sono da 5+5 anni e costan poco se hai determinati requisiti anche se non ne vedo utilità se continui a lavorare in Italia, il tuo capitale non conviene portarlo in thai nemmeno per fare business visto che il 90% dei business di expat falliscono.
I paid taxes every year for my retirement, don't need to have work permit. You can go at tax office that belong to your residence address and submit the amount earned and they do all papers work for pay tax
Bitkub is legal in Thailand and maybe can release a statement valid for immigration. Ask them the release of the statement for immigration and try the application for the visa renew, maybe there is also something more to show.
I saw people having problem to transfer big amount to other name and not only in Thailand. Try to ask at your bank if is possible to transfer as a gift or try an online currency exchange.
you can open a bank account in switzerland or other countries that allow free flow of income. Eventually put the account in name of a company if needed. You will pay tax in Thailand only on what you transfer in the country.