This is an extremely bad idea. It's generally not legal to transport remains of any kind without quite a bit of paperwork, and international transport is even harder. I had a friend die in Brasil a while back and it took a couple of months to get the paperwork in order for the cremains to be brought back to the US. I have no idea what it would involve going the other way.

If you don't get caught, then you're ok. But, especially in foreign countries, if you're caught, you will be in a world of hurt.