I was somewhat surprised to see TG trumpeting Star Alliance Gold Track (ie airport fast track for Star Golds) in their latest March email newsletter, given that they don't offer it at their home airport. Indeed they don't provide a link to the list of available airports, from which BKK is absent.
Royal Orchid Plus E-News
Gold Track Airports Overview - Star Alliance
The banner is "The way we get you through the airport faster", which could perhaps also say "... except in our home airport BKK".
But maybe we should read into "... is being rolled out airport by airport across our network" that it may come someday to BKK ?