I didn't quite understand what it is you really need to find focus and have a 1.25 filter thread.
Do you need a shorter optical path or a longer one?
does this meet your requirement?
http://www.baader-planetarium.com/en...%C2%BC%22.html
Baader's T2 adapter range here:
http://www.baader-planetarium.com/en...t2-system.html
They're probably all available directly in Aus, too.