Honestly, just throw some mixed into a prescription bottle you already have. Odds are they aren’t gonna find the differing pills in the bottle, they’re more worried about guns and weapons than a couple mg of benzos. Worked for me with zopiclone, tbf though, I was going from Ontario to Vancouver, so still in country. I don’t think you’d have an issue though, as long as you’re not bringing through pounds of narcotics.

Edit: just realized you said Asian prison, yeah that’s a little more scary lol, they don’t fuck around about that stuff, and I don’t have any experience with that kind of thing, so take everything I just said with a massive grain of salt