So, those harmonics I mentioned, for the FM broadcast band between 88 MHz and 109 MHz, they’re between 176 MHz and 218 MHz.
Guess what?
They’re allocated to other services, specifically television and digital audio broadcasting.
I can guarantee if you power up a “low power FM transmission” that the FCC will come and find you and rain hellfire on you.
It would be entertaining for the audience to be sure, but I’m not convinced that it would “get folks interested in radio”. You could do a roaring trade in popcorn.
In case you’re not convinced, the FCC fines are hefty and low power isn’t a thing. My legal amateur radio beacon uses 10 milliwatts and has been heard 13,945 km (8,665 miles) away.
So, regardless of content, that’s not the way to win friends…