here is something to consider,
on the back of the wheel where it mounts to the hub ,
can it be made so that there will be cutouts so if someone was fitting bolt on spacers the bolt on nuts will clear?.
I ran into this issue today,
the wheels were actually seated on the studs and not mounted to the spacer surface this resulted in a wheel that would wobble
Good point. When I put my rear spacers on at first I thought it would not work, but then I saw the bolt heads would fit into the recessed area between the studs. This is on my stock Porsche wheels which I actually like.