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Probably easier just to say that your idea wont work. There are so many issues. I had this situation last year and I was lucky but it involved me walking up and down between borders in no mans land at Sadao 2 or 3 times. I learnt the hard way. I didnt have a clue and tried to wing it.
The problem is your old passport will not be electronically activated as they deactivate as soon as the new passport has been applied for. Also when you leave Thailand on the old passport they will stamp this with the exit stamp and not the new passport. So whatever country you arrive into they will insist on seeing an exit stamp in the passport you want to use. Ofcourse you cant show them the exit stamp on the old passport as you cant use that to enter the new country. So its like a yo yo effect back and forth. So you have to get the Thai police at your exit to stamp the new passport with the exit stamp. Sounds simple but it may not be. I was lucky but not sure its normal procedure for them to do that.
As far as the Hull idea goes. I suppose it could be technically possible as the theory could be the same. If you can get the exiting immigration to stamp the new passport with the exit stamp and not the old passport and just get into the next country then it could technically work but very risky. As someone said, if you get a switched on immigration guy then it could go wrong. Wouldnt advise.
I think the 100% best/safe way is to just get the stamps transferred in Bangkok when you have both passports. I have forgotten what the place is called but you can get them transferred for a fee. Then just get a visa from a nearby Embassy. I know its not as good as the Hull option but I would forget the Hull idea. Its risky. Remember, no one knows what checks Hull make with Bangkok when processing visas. What if it all goes wrong and you are stuck in Thailand with an old invalid passport.
Edited by rinteln, 2012-02-09 10:20:10.
