An alternative I have seen used around Sydney dive sites is a regular pair of specs without side arms mounted on a go pro type mask clamp on your mask that you can flip up and down as required.
I'm Chris Ross, from Helensburgh just south of Sydney, happy to be involved in establishing this new community, I was previously one of the Wetpixel moderators. I do much of my diving around Sydney so I can dive all year round and also enjoy dive travel. Look forward to establishing this site as a great resource for all interested in UW imaging.