Dynamo for bicycles is for bicycle speeds. When your M/B get past 30mph the dynamo makes too much voltage and blows the 6v bulb. Never had one on a M/B but that's what I hear.
Short from putting a M/C engine on your bike. I don't think the Cops will think your M/B is a M/CRegarding lights? Eh, I'll probably stick to $10-15 rechargeable bike lights from ebay. If I start putting motorcycle grade equipment on it, that gives the cops more reason to say it's like a motorcycle.
Short from putting a M/C engine on your bike. I don't think the Cops will think your M/B is a M/C
Your already gonna have a hand throttle and a clutch lever, that's M/C grade. Actually the more DOT approved accessories ya got the better. Whatever makes your bike more street legal the better for the Cops to leave you alone and what a better way to do that than use Moped, Scooter or M/C parts. You've seen my bike, I tried to make it look like a small M/C on purpose. I even showed it to the Cops and asked them what they thought it classified as and they told me they call it a Moped. Motor W/pedals. I even got pulled over by a Cop. He didn't want to check my reg or insurance or look for a M/B sticker. The Cop wanted to look at my bike. He thought it was COOL and said he never seen one like mine before.
You worry about the Cops too much. Just don't ride around with a beer in your hand and you'll be fine.
Moped, Scooter or M/C accessories.
You've already found and showed alot of parts I don't think you have any problems finding parts.
The accessories I use requires 12v Like I told you my Whizzer has a Stator in the flywheel and makes it's own 12v power.
But here is a link to where ya can find parts like mine www.whizzercruzzerparts.com The parts are kinda $$$ since Whizzer went out of business. Cruzzer is a clone and the $$$ went up. But if ya search E bay you can find all kinds of new cheep good stuff.
The Schwinn has my vote. Best platform for a cruiser M/B