I agree with the legality of the all the above.
However, the OP would be wise to consider the practical situation. Jim hinted at it above - it is what happens on the ground that matters - and I have seen some horror stories.
Moving money online or via an ATM is a smart move, prior to death or after.....irrespective of the legal position it is an effective way to distribute the funds - and will save costs if Probate does not need to be obtained. Remember also that dealing with an estate in Bangkok, and maybe Pattaya, can be totally different to Sisaket, Surin, Buriram etc.