Did we eliminate pedal assist already?
The Ebikes facilitated by the City of Santa Cruz use Pedal Assist.
There are about 300 of them scattered around town.
They move out pretty well.
That eliminates the throttle install details.
If its a custom setup (as can be procured from Grin) the OP can dial in whatever level of assist he desires. He can type so he can tune a CA.
No doubt a bike mechanic can install the magnetic pickup on the crank - I just removed one the other day and it requires either no special tools or a single special tool. The reset is just zip ties.
A CA can be adapted to literally any ebike controller on the market.
Ebrake (or omit)
Shunt +/- or inline puck
Pulse input from a crank set
As for soap boxing...
From my soap box I do not believe that anyone becomes incapable at any point in time.
Incapable is a decision. If we have to we can duct-tape a wrench to your arm and spin you around in circles...
But it is required that you fight till the end, nobody said it wont hurt, and yea... its a trust exercise.
Incapable is a spectrum
Not a binary True or False
Therefore it can be considered a spectrum of capable
There is a surf instructor across the street from me. A guy comes around sometimes who does not have use of his legs. He goes out surfing. He has to trust the instructor not to let him drown.
Otherwise - its simply a socioeconomic thing. There is a paraplegic man in town who had a custom chair put together. It raises him up to "standing eye level height" (balancing) and he can even navigate stairs. As far as I can tell... mentally... he is 100% "normal and well adjusted"... and I think a lot of it is mental. Deciding to innovate to make yourself bionic so as not to have to feel inhibited.
end soap box
As I said in the beginning
If you frame the argument the same you will get the same results
Original problem to solve was already described
Free advice above from others - for more free ideas re-frame the argument so that you are solving something different.
Increasing battery voltage and controller current limit will result in a non linear experience