If you need advice that particular kind of DIY, feel free to post here and tag me or DM me directly. Hopefully I can be very helpful to some of you folks who either can't afford to pay expensive mechanics or want to learn on your own.
I work as an independent mobile mechanic in middle Tennessee (for now). My primary work is motorcycles and small engines, but I've done plenty of work on cars too. I used to post quite often on r/fixxit back before I left Reddit.
Pic is an example of my work. That's one of my motorcycles, which I resurrected from the dead. I took that picture while was riding to the small town of Cave-In-Rock, Illinois, to rebuild 4 carburetors for a customer, and in line waiting on a ferry to cross the Ohio river.
It's a neat idea, but you know what the most practical "hybrid" on two wheels already is? A hybrid between human pedal power and an electric motor: the E-bike. Honestly if they weren't so expensive they'd completely wreck the 50cc scooter market. Very similar use cases, lighter, about the same speeds, more nimble, easier to park, and better exercise. In a place with decent bicycle infrastructure they're absolutely ideal.