[stephen low]

Liam

There you go, a personal recommendation not to use filler but I just thought of another important reason to try and do more than glue the steel to the glass.

You could also use a sikaflex as suggested and this will glue the steel to the glass but what you really want is the glass panel to be intrinsic with the steel in the event of a side hit.

By glassing the steel onto the panel you'll increase any impact protection. Just stuck on the separation of steel from panel would be easier than if bonded together.
Admittedly the glass is only a fraction of the steel's impact resistance but that fractional improvement by bonding might make that difference in a side hit.

Just food for thought.