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I would start by just trying a ~18-24 inch square of
"finger foam" (the kind with an array of "fingers"
cut into one side. Have someone hold it around the
vent to see if it has sufficient acoustic dampening
effect to be worthwhile.

NOTE: Most anything you put there that will truly be
good at absorbing sound will almost certainly also be
very good at collecting airborne lint also. This can
easily build up to become a fire hazard unless checked
and cleaned out VERY frequently (monthly, at least).


Agreed. I'm definitely aware/concerned of creating a ventilation
issue and the lint-collection problems associated with it. I'm hoping
I can do this without compromising on safety, of course. Thanks for
the comment, though. Much appreciated!