I’d say at least experiment with those modules to see if you can fully set it up. (It would feel sooo good.)
Although it’s not as elegant of a solution, I think I’ve read about people wiring an electric unit to a switch or a potentiometer so they could manually turn on power steering just for parking.
Totally different topic: What is your ground clearance at your new under-nose section?
Oh, also, have you found ANY product that can bond to a modern OEM flexible bumper? I noticed you were using a lot of aluminum tabs and rivets. But energy then, did you need some special type of body filler to finish it out? I can’t get anything to stick to my front bumper mockup.