Have you thought about an ebike?
While there are those who shun the ebike, your situation is such that a center
drive model would address.
The power(40 - 60 nm of torque) come from the motor, but the spin comes from you.
Augmenting your abilities.
On of the best things a cyclist can do is keeping their cadence
up to a point of comfort, and spin efficiently, that is in complete circles.
While it doesn't require a great deal of strength to spin the cranks, it does to
propel the bicycle and rider forward.
The centerdrive motor augments this spin, the gearing on the bicycle allows
you to manage the strength aspect.
And I don't believe and centerdrive models are available with a a throttle - to "cheat"!
Anything to get more "butts on bikes"