I think with regards to vintage scooters, beyond a love of their looks is a love of the sound, the smell, the shifting, and the ability to tinker with the engine.
Electric scooters are nearly silent, odor free, I have yet to see a manual transmission setup like one enjoys on a vintage, and you can't get all greasy trying to keep it alive and squeak more power out of its engine. They have none of the qualities which draw stinky old 2T vintage nuts except the shell of the body. For me the satisfaction of keeping an old scooter on the road isn't about keeping the frame on the road. It's about keeping the engine running... the historic machine on the road.
Electric scooters may be the future. They may be better for the environment. If you are electrically inclined, they will be a fun project to make. Indeed there are tons of pros.
It's not all about the numbers on a sheet or emissions. It's about visceral emotions. People like what they like. Same reason you see resistance to 4Ts in this crowd. It doesn't always make sense. But it doesn't have to. It's just what they like.
All of that said, I think it's a fun idea you have. And electric scooters WILL suck without innovation and drive to make something usable like you have. It will never be practical to leave town on an electric vehicle without people like you in the industry. Good electric vehicles people want will result in the filling out of the infrastructure necessary to make them practical on the road. Kudos and good luck.
Taking what I said above, it's important to remember that even though electric scooters tend to have nothing in common with vintage 2Ts (except potentially the body in your case), it doesn't mean there aren't people who will prefer your machine to the former, or people who will love both. I don't have the money to buy or build one, but I won't discount myself being in that last crowd... I love gadgets!

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