I would prefer to modify the bonnet as well. Just concerned you may loose bonnet structural integrity if cutting out the fwd strengthening ribs. Need to weld in or attach perimeter strengthening frame, especially if use fiberglass scoop.
I had bonnet modified for Jonny Tig scoop, some structural ribs at rear were removed but is OK, not sure of your GQ bonnet structure (looks similar), but up front in GU you would need to remove a far bit of rib strength.
Not sure how far you want to travel, but Jon from Jonny Tig Industries (Adelaide) does very good TIG weld fabrication work and does a larger scoop (higher) for GQ and GU patrol for his cooler. Does custom work, I spent a few days with him last Sep working on my cooler install. Let me know if you choose to check it out Phil.
https://www.jonnytig.com/