Hand Controls for disability

Forgive any over-reach in this response. It isn't intended to be rude.

The broadest answer is not to have your car modified by a chain that copes with competition by purchasing all its competitors. This allows you to shop outside the Braun/MobilityWorks network that restricts equipment choices and has you dealing primarily with salesman. That means finding an independent installer who will help you choose. <-- this is what good salesmen should do.

The rod&lever hand controls that are part of that world aren't too expensive and work on a wide range of vehicles, but they do require that the steering column be locked in one specific position. My wife currently uses an apparatus from a german outfit - a single lever that presses the accelerator when moved backward and the brake when moved forward. It doesn't touch the steering column and folds out of the way so I can drive her van. It was expensive, but I wouldn't have known about it if we'd used the huge regional installer.

I don't know your disability, but I wouldn't use a Prius as a base vehicle if your problem is your legs. It's a low car with a low roof and getting in and out is sportscar like. If you use a rollator or will in the future you don't have a ton of extra room for it.

A Corolla Cross doesn't get the same efficiency, but it's taller with more head room and really useful cargo area. If there is a scooter or chair in your future, you might even be able to get an Armstrong device in the back.

Toyota's updated active cruise is genuinely useful for not having to work the pedals too.

 

I believe it was Veigel.

 

Sorry, it's just getting a lot tougher to modify modern ECU cars for people with disabilities. Most car manufacturer claim proprietary knowledge over their CAN bus architecture, making it difficult - if not near impossible to send the proper handshaking signals to properly communicate acceleration and braking commands. A simple potentiometer output is easy to replicate, but if the signal is digitalized and fend into a CAN bus, signal id's and protocols must also be duplicated for the ECU to recognize it from the other signals traveling the network. So even if you've got the correct information, you'll have to program a translation module for the input system your working with to properly communicate with that car's CAN bus. That's why your only allowed to buy and they can only modify certain cars.
Forty years ago, My dad owned his own repair shop and we modified a half dozen cars. Mind you, everything was mechanical back then, so simple pulley and bicycle cable system. Everything needed to be fabricated from scratch - No 3D printers then. Making sure there's no way the cables can snag on anything. We actually lost money on each of those jobs, but just chalked it up to community service.

Hope this clears things up....

Happy Thanksgiving everyone...