This may be way too "industrial" looking for most & so far it's just a random thought. What does anyone think of removing the stock fastening posts on the insert, drilling through some or all of the former post positions & refastening with stainless cap screws w/ washers through the orig. mounting holes in the hood? You could even incorporate a couple of hood pins.
It would make insert removal for drainhole cleaning way easier.

Inquiring minds wanna know. Ldub