I did it in Bangkok (followed by registration at catsip) but that was 2012, no idea if it is possible anymore. But since the op seems to be okay with converting, then he might as well do that since it is easier and cheaper.I remember another member went down the SG route but you have to stay there for 30 days or something
And another member a woman if I recall did it in Bangkok
But it's a lot different these days
This sentence makes me think that everything will be fine. To even have entertained this option she must have already escaped the childhood indoctrination that she had. Also, the fact that the parents have some money and the eldest siblings also seem to have good jobs is very positive....or that she converts to Christianity and we get married that way.