On my K11, I have no PAS, it's ok if I keep tyre pressures up into mid 30's psi region. Though just a question, would having alloy wheels over stock 13' steels, make the steering lighter?
I doubt it, imo the lighter rotating mass would only make a difference to steering at speed which isn't when you typically need power steering.
On the other hand trying to keep the offset reasonable so that the scrub radius is close to zero might make the steering lighter, were there different wheels standard for PAS and non PAS models?