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a 2" barlow still may not let you achieve focus, what brand of binoviewer did you get? a 1.5x OCA is a little unusual
as you are in Melb & i am close by we could meet up -i have a 1.6x william topics OCS you could try -though i am guesing if your focuser has not much travel you need to take a trip to bunnings to buy some longer bolts -place them at the bottom of the mirror cell to lift the mirror cell up the tube -you will need a good 5cm i estimate. most binoviewers add about 10cm to the optical train
pm me if you want to meet up
PS i also get hassles looking thru just one eye for long periods
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