Isn't this what you want? Pick it up from the Smile counter at HKT and drop it off at the Smile counter at BKK.
https://www.klook.com/activity/16446-4g-wifi-thailand/
Pick up and drop off your portable WiFi device at a 24 hour counter located in either the Suvarnabhumi Airport, Don Muang International Airport or HKT International Airport
It's the same link
transpac posted in post 2 in this thread. I guess you have to ask them about the open jaw thing?
-David