Mike,
Last qtr moon next month at Kulnurra would be a good time to do the test. If we can get the eyepieces we could do the 6mm and 9mm on the same night. The seeing out there should hold up easily at 200X later in the night. Targets will also be favourable as we can do some DSO's earlier in the night and Mars and the Moon later in the night.
We just need to source the eyepieces
CS-John B