I visited both Bangkok and Hua Hin in Thailand in August 2018 with my family.
Originally, I had no idea there were any pinball games in Hua Hin, but I accidentally found a pinball location – The Whaley Port amusement centre inside the city of Hua Hin.  It is located on the 3rd floor of the Blúport Hua Hin.
Whaley Point amusement centre in Blúport
There were 2 games located in the central area of the centre:

Metallica Pro (Stern, 2013)
The Avengers Pro (Stern, 2012)

Metallica Pro and The Avengers Pro
As usual, it costs THB20 ($0.61/€0.53/£0.47) for a 3-ball game, and with low replay scores.
20 Thai Baht per game
Low replay scores
Unfortunately, they were lacking regular maintenance – the playfields were dirty and some of the components were not working.   Anyway, the condition of these two games was of an acceptable level.
Cleaning and maintenance needed
Here’s some additional information:

Business hours: Sunday-Thursday 10am-9pm, Friday, Saturday & holidays 10am-10pm
Website: www.facebook.com/WhaleyPort
Comments: The condition of the pinballs was of an acceptable level