The thing to do would be to draft a couple of form letters that couch our arguments in reasonable language:
*Negative health consequences of cumulative hearing damage.
*No knowledge of cumulative hearing damage in 1934 when the law was originally passed.
*Urban encroachment on existing shooting ranges, sound suppressors could help to make good neighbors by reducing noise pollution.
*Never used in crimes.
*Have been legal for use in many European nations for decades with no ill effect or increased crime rate.
*We put mufflers on everything else: cars, lawn mowers, everything else that functions with internal combustion.
*Moving them to Title I is a reasonable course of action, because it doesn't completely remove all governmental control over them. You would still have to go through a NICS check and fill out a Form 4473 to obtain one.
For what it's worth, if you use a little imagination, it's extremely easy to couch this argument in terms that make it appear to be "progressive" or whatever. You're showing concern for your fellow citizens: reducing health care costs, reducing noise pollution, following the leadership example of those erudite and civilized Europeans, and, hey, look, we're not asking you to hand the things out to anyone, there will still be background checks, but now they're just streamlined and more efficient.