I can completely respect that need. Should you choose to consider a muffler upgrade, you may be pleasantly surprised at the sound levels of the Monster Ovals. They're quite tame at low rpm's and even when you romp on it they're not obnoxious. Very radio friendly. All low tones without 'booming'. Sounds like a 60's muscle car. Try to find a local rider with them on just to judge for yourself. I have a similar concern and the neighbors even smile as I idle by when they're walking their spastic tiny lap dog.
Ride safe.