Any question answered...

I was also wondering, if I use the wheels as they are (road mode), can I potentially damage the hub thread; being a track hub there is less thread for the block to sit on, I have a bad feeling about this...

I suppose you could, because with a multiple freewheel you'll often be applying a big bending moment in addition to the drive torque, due to most of the sprockets being outboard of the support.

Using non-Campag cones might work if they are designed for the same number and size of balls as the Campag ones, but aside from being a shame and a risk it also means much research finding the right match, and then the cone and locknut depth will probably be wrong so you'll need to find spacers to get the OLN right.

It all seems like ten times as much hassle as you need