2 speed wiper motor with universal switch question?

I'm learning more about the 2 & 3 speed, Del. I have a couple 3 speeds I can play with. You probably know more than I at this point.
My end goal for now is to come up with some way to run and park the motor from the dash without the factory switch.
What I think I know is, 3 speed-wise, the switch reverses polarity going to the motor causing it to run backwards until it parks.

In forward (dash switch on L,M,H) the islands and outer cam guide the rocker arm around the latch.

In reverse (dash switch off) the outer cam and longer island guides the rocker arm down into the latch which rotates the switch cam out to contact and open the park switch, stopping the motor.
As Johnny Mac confirms, it's fairly easy to mimic the forward part of this. How can we mimic what the switch tells the motor when it's time to park, is the answer.

That will be in the truth tables and wiring diagrams of the FSM, I think.

I know it would be easier to just buy all new or nos or rebuilt **** and be done with it. That's no fun...........
i thought about trying to put in a momentary switch that sent power back to the..."normal ground" but then the other switch would have to be in the off position, and you'd have to have a way to ground the otherwise 12V wire...or there may have been a different wire altogether that the ground circuit would have to run to, cant remember now. I guess at that point i didn't see any point in "bumping" it backwards having any benefit vs bumping it forward. in a factory setup the auto off would be nice. I drove an 86 K10 pickup to HS and college that didn't even have a park feature, or if it did, it never worked....so just bumped them around until at the low spot lol. First world problems :p