Hi Aus_SQ.
I've only a third of your gliding time, I did put it on my CV when I was down in Bots (around Feb 2013). The deal back then was 300h TT min for work visa. I had only two-hundred something hours on powered acft back then, however if summed up with the gliding hours I'd have over 300. Asked the operators if that'd be of any help, got directed to the 'agency' dealing with work visas (outfit by the name of Jambalaya or something like that) - they said it's 300h on powered acft minimum and my gliding hours won't help me.
That was almost 2 years ago though, so I'd imagine the situation might've changed a couple of times by now :P good luck!