Apologies for the slow response - I am a little behind with my reading.
As a former long-time resident of Canberra, and a shorter-time (about 15 years) federal government public servant in Canberra (ABS and BACA), your post interests me; especially the following sentence - "I have a Government Service Lifetime Pension that is specifically mentioned in the Australian Thai DTA and is only assessable in Australia."
Could you please provide the URL of the "Government Service Lifetime Pension" site - I did a Google search, but could not find it?
Secondly, after reading the Australia-Thai DTA (signed by then Treasurer Paul Keating in 1986, for memory) (and maybe I fell asleep, several times) I can recall no specific reference to "Government Service Lifetime Pension" which " ... is specifically mentioned in the Australian Thai DTA ...". Section, clause and page numbers in the DTA would surfice. As I stated above, I may have missed it.
Many thanks in advance.