Here's what the backglass looks like.
I was able to remove the channel by tapping on it with a wood stick and a rubber mallet.
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I was thinking of Triple Thicking first to seal everything in, then trying scratching off the left of the Canada flag and the right part and color matching with Createx and then painting with opaque gray paint. Since no light goes through there shouldn't look too bad.
Then the goalie who's missing a few spots I might try to color match and fill in with a small paintbrush and doing a few tries over the Triple Thick until I get it good enough.
The bottom mirror part, I obviously won't be able to do a perfect job but I was thinking of trying to cut below the black line with a razor blade, then scratching off then maybe trying some kind of mirror paint?
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The idea being to get it to look mirrory, not expecting it to be exactly like the rest but at least since there's a black line to delimit it it should't stick out too much.