I wanted a mechanical bond in addition to sealant/adhesive so I used a low profile threaded thru-hull cut down to size. It protruded a bit but it's not really running surface right there anyway.
The only worry I would have with what you want to do is not having the epoxy just run away when you inject it. Also, you have to figure you get a lot of vibrational forces right there when blasting through chop so you want a substantial bond.
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