I had an S1 Roadster for 10 years and now own a new one with the 5 link rear (with a long snagging list)

King Pins, no problem now, you will get hard chrome with bronze bushes, bearings under the main springs, etc (but not remote greasing - I prefer the see what's happening when I grease anyway)

Rear panard rod is part of the 5 link anyway, adjustable shocks umm matter of opinion - I have to admit that I have given in and very recently fitted a SSL (suplex) kit to the front as I was sick of the nodding, I had Suplex on my S1 and must have become accustomed to the ride quality

I can't comment on ceramic coating, but feel it's a bit of expensive snake oil for road cars, fingers crossed mine has coped with temps in the 30's recently, but I do feel the radiator is marginal on capacity as the fan cuts in very quickly in traffic and runs a long time compared to the S1 which has a proper brass/copper rad - I'm suspicious ALL models of trads 4/4 upwards get the same rad fitted now

Sump is no issue on the 3.7 compared to the 3.0 as it's not tilted over, you're probably more likely to catch the cross member of the chassis, but 'Wolf' mike a rub plate to combat this

Keep us updated on progress, as this method of getting Trads into America looks good news

Jon M