A few months ago went OS/OS/TG AMS-VIE-BKK-SYD on single ticket with shortened 40 min VIE transfer. No worries at all and bag turned up at SYD. Just said SYD was final destination. Couldn't have been easier.
on single ticket is the magic!!! That usually works, particularly in VIE (done that too on extremely tight PRG-VIE and then -BKK-MEL), but otherwise? Not so sure...