Teslas are so thick on the ground here in the NE Metroplex you can get where you're going stepping from one to the other. You go to the showroom, commit to buy one, sit down at their computer and order it from California, where, technically, the sale takes place. It arrives with a packet of paperwork you take to the Texas title office and transfer the California title to Texas.

Now that we have that out of the way...

OP, your hybrid drive motorbike idea has a 32cc piston engine. In Texas it's a moped. To be legal it will need to be registered, have an annual tag, need to carry insurance, you will need to have an operator's license, and the moped will need lights, mirrors, a horn and turn signals.

In actual practice, there's not one Texas cop in 50,000 that would pay attention to a non-compliant home brew hybrid drive moped as long as you ride safely after the fashion of a bicycle. The only problem is getting into an accident - even if it's not your fault, you're operating an illegal vehicle on the public roadway and you're going to take one in the shorts.