Oh interesting! I had the same idea about the Tokays initially, though most of people say the gliders will prey on the Tokays. I was thinking about introducing Tenrecs...
Tenrecs would be good.
Gliders could and would attack a gecko, but TBH, my experience of the tokays, pretty as they are, is that they will bite anything that touches them, I know a few private keepers and none have ever not been bitten by them, they're quick too, not sure they'd outrun a glider, but it would be a constant battle on who was chasing who!