Thanks!
It's a bit fiddly, but it seems to work.
One thing; there is a missing step, of sorts:
Drag+drop, Left click for place, left click for rotation, then right click
Bu upon further testing on my end it seems that this still only works as expected if the model is already downloaded. If it's a new download, any click variation will still import the wrong material type... I'll keep testing but it seems if I import 'correctly' a new model it uses standard material. If I import that very same model again once it's already downloaded with the 'correct' click procedure it works as expected and imports with Corona Material...