They say CELTA can be challenging but in my experience, as well as in that of my groupmates' and colleagues'(doing the course at different schools), it was a thoroughly enjoyable course that left enough time for sightseeing and meeting up with friends. I'd think it's all very personal in terms of trainees and trainers alike and, probably, trying to contact another centre might be an option.
Another their statement I found difficult to accept is that people learning teaching from scratch will be better off than professionals. I'd even say the course is initial to such extent that not every practising teacher might feel comfortable enough to go that back to basics. On the other hand, TEFL overseas, if compared to uni at home, is a totally different kettle of fish and one should be more than just flexible to get it right.
On the whole, it's a pity I can't do CELTA twice but being practical, all it could offer was just a certificate (clearly overvalued in this country but not even close to the national tefl qualification) and a bit more confidence maybe (but again, it's rather personal).
Admittedly, Asia is too sunny and hot for my liking so I can't be of much help here. There are quite a few EFL teachers from that region on LinkedIn, though.
Hope it could help a bit. Good luck.
Student or Learner