Harry,
Just about anything is possible.
Whether or not it is reasonable or rational or advantageous is another question.
I, like Maytagbear, have found it easiest to spin that wheel (just listen to those clicks and that delightful, mechanical sound of rack and pinion scraping past each other!)
Yes, I spin it back to two clicks before the end of the first wash cycle. This gives me a three minute deep rinse, a spin, second deep rinse and a second spin.
Not to mention those five or six spurts of water hitting the depth of the moving basket during those spins.
O!
Now, you could, of course, build a cam and follower which, upon the dial hitting the spin section, would slow the motor down to 50 or 47H. That is about as far as one should go with that design, should overheating and hysteresis problems be avoided.
Not hysterical, by the way.
Several here are capable of designing and machining such a system.
TTFN, I have a steaming croissant and raspberry jam waiting upon me.