MUC-VIE-BKK-TPE in C for 65000 Miles and 210 EUR of taxes.
MUC-VIE is operated by OS
VIE-BKK-TPE is operated by BR. Unfortunately while I was flexible date wise I needed to also have availability for the return (for which I used AF and a Flying Blue award) and the only pair that works where one where I have 8 hour layover in VIE and the BR service with a stop in BKK. So it is a 24 hours journey, which is a bit long.