International to Domestic (with a boarding pass)

www.suvarnabhumiairport.com

Transfer from International to Domestic flight with a boarding pass
In case passengers traveling to “Chiang Mai, Chiang Rai, Phuket,
Hat Yai, Samui or Krabi”, follow these steps:"
この時点で、回答おしまい・・・ですよね。

もっと問題なのが、
Our flight was late, but we managed to arrive at the ThaiSmile ticket counter, which is just before the domestic transfer Immigration area, 40 minutes prior to our ThaiSmile CNX departure. (I believe the cutoff for checking-in is 30 minutes.) I said we only had carry-on bags. The attendant at the ticket counter called someone, and after much discussion told us we had to clear regular immigration, proceed to the Check-in counter, and then clear Domestic security. She said that JetStar & ThaiSmile do not have agreement to use the International to Domestic Transfer. Needless to say, we missed our flight and had to rebook.

入国させられたということ。

搭乗券自体は24時間前ならオンラインチェックイン可能なのですが、
一番の問題が、
CI 833 TPE 0720 BKK 1000
CI 831 TPE 0920 BKK 1200
CI 835 TPE 1330 BKK 1600
CI 837 TPE 2205 BKK 0035*

WE2/TG2002 BKK 0740 UTH 0845
WE4/TG2004 BKK 1110 UTH 1215
WE6/TG2006 BKK 1440 UTH 1545
WE8/TG2008 BKK 1740 UTH 1845
WE10/TG2010 BKK 1915 UTH 2020

CI833-WE4
CI831-WE6
CI835-WE8とかではないのかということです。
かなり危険と言うか、無理な組み合わせもあります。