I've used the standard length ones in the rear for just rolling it around, but the thread engagement was too little for my comfort. The fronts should work with the standard length as the rear ones have a little more distance to bridge with the spacer in the drum. The front ones don't have that problem and standard should be fine.
As to poking outside of the body I can't say anything other than that the rears are borderline illegal (where I'm from 30mm outside the body is max.) and the fronts will not fly. From what I've heard is the spacing with 7,5"discs slightly less so it could be that it will work with 10" and archless.
Just cheked the offset with JBW wheels and the 12" is 25mm and the 10" is 17mm. That would mean that 10" wheels poke out 8mm more than the 12" ones. So if you are going to use spaced Minifins in the rear the wheel will sick out more and arches will be a must. Using standard arches would be a perfect fit in mu opinion. The other option is the Group 2 arches that are relatively narrow and have the ability to fot the chrome surround.
My advice would be to go with a D1 if that is the style you want as they are not available in 4,5J as far as I know. If you want fitment without arches a 4,5J wheel would possibly be the safest bet, although I will admit that a little poke with 10" wheels does look excellent.