Barry if you can - just be safe and deposit 65k each month, don’t split it up unless you really have to. Many people use Wise to xfer to Thai back - personally over the last three months I’ve found Western Union offering better rates - example for today in photos. Most banks will charge more
For exchange - some folks will disagree but I give you my experience. One final point, I prefer not to xfer on a Friday or weekend as it may take one or two BUSINESS days to xfer and that can sometimes be a little unsettling. Good luck.
An example for you bud - out of a grand: the tenner slight tear, the score they couldn’t fully remove writing on the queens face but they tried - both rejected. TT Exchange Pattaya