No, I'm not joking:
Now play Plinko with it!
that could be more annoying on a group ride than 'spoke a dokies'
Bianchis '87 Sport SX, '90 Proto, '90 Campione del Fausto Giamondi Specialisma Italiano Mundo, '91 Boarala 'cross, '93 Project 3, '86 Volpe, '97 Ti Megatube, , '90 something Vento 603,
Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '09 Motobecane SS, '?? Jane Doe (still on the drawing board), '90ish Haro Escape
If you had only been running that a while back, maaaaaybeeeee, jus' maybe, that duffus who hit you with his car would have heard you coming and yielded to you your right-away!
Now can you make that work in backup mode?
I dare say a beeping Dynohub would be the perfect thing to infiltrate a roadie peloton with. Just tell them it is an audible cadence meter.
Backup mode? Sure, it'll work, but I don't know what circuitry is required to quiet it the other way 'round. This is AC, not DC.