Vietnam eVisa. About 5 days according to people’s experiences here.
Malaysia, Cambodia, Indonesia all switched to eVisa now. Laos is also in the process to change the system and the last in person appointments are fully booked. and for evisa they claim 15 days processing time.
for the DTV application you usualy dont need a booked flight. you have to provide a flight number which can be any flight you might take. (in case a booking is requested at a later stage then just book an onward flight ticket for 5-10€$£ / „rental ticket“)… for accomodation you usualy only have to input the details of your planned accomodation. this can also change anytime. could also book a fully refundable hotel on agoda and then cancel it.
yes no thai bank needed… depends on the embassy you go through. some demand only a current bank account overview… some require bank statements 1 month, 3 month, 6 months…