Or if I have new tires road force balanced when I have them installed, can I forget road force vibration?

Continental US web says that the relative placement between the tire and wheel tend to change in the first few hundred miles due to the lubrication used for tire mounting. Is the lubrication used only for the first installation, not when the tire is remounted to the wheel to cancel out road force?

__________________
1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.

I think that you are really splitting hairs here.

RFV numbers will certainly CHANGE, but not significantly. If the tire is within spec and oriented properly on the wheel, you may have a change, but unless the RFV numbers are really out of whack to the point of defective tire indication, you will not be able to detect a problem while driving.

To put it another way, if the tires are decent without significant RFV, it is unnecessary to recheck RFV, or simple balance for that matter, unless vibration is felt.

Good luck,