Strategy for installing rivnuts in sheet with inaccessible sounf deadener

The front inner side skins are covered by non-inaccessible sound deadening foam. My concern is that setting rivnuts will lead to a suboptimal result, owing to the adhesive layer (yet alone the foam) that will likely be caught between the rivnut and the aluminium. I have found an approach which not only ensures the foam will not get in the way, but also removes the adhesive layer in an annulus around the hole. This result is achieved by access purely through the 15/64" hole from the interior. The procedure is shown on a test strip of 0.4mm 6061-T6 primed and painted as with the inner side skins, with sound deadening foam on one side.