More torque to the wheels, less angular velocity, less peripheral speed, greater losses due to the complexity of power transmission.
There is some work to do but in general it is feasible. Dream big!
I had a similar idea but not this one. I designed a type of bike with a special big chain wheel. It was a half- baked idea but I didn’t try to complete it to offer anywhere. Nevertheless, I still am sure it works with all its advantages.