I learned to sew on a 201, and it's probably one of my favorite machines.
If I could figure out how to turn it into a treadle without losing the motor, I would.
I use it a few times a week now. Same machine I learned on. Mom got it in 1966 or 1967 for $100 or 125...back then it was like 1000 USD now, and it was a used 1952 model.
Well I did virtually that with my Pfaff 30 treadle.
It also had a motor.
I had it rigged up for treadle use by just unbolting the motor and belt and laying it on the back of the treadle so I had the best of both worlds.
The motor was never used again as I enjoyed treadling a lot more.
I found I had more control with the treadle.
Stopping it by pinching the belt and delicate slow stitching by teasing the belt down with finger and thumb.
You are a trained tailor so you know what I mean.
If your machine is of the Alluminium kind like mine, I have seen that somebody converted it to hand cranker with the old style spoked fly wheel.
So I believe the old spoke 201 flywheel will fit the newer 201s.
You will need this type of wheel for a treadle.
Treadles also have some awesome punch.
I did a you tube some years back on my treadle Pfaff 30.
It went through eight thicknesses of thick denim.
Peter Cane Pfaff 30 treadle should get you there should you be interested.