First off, you don't seem to understand what dish is. Dish is about having the rim centered between the locknut. There is no such thing as more dish or less dish - either the wheel is dished or not. All wheels properly built are dished. Dish is NOT about the difference in one side versus of the other. That's a description of offsets...
However what it appear to be that you reall want is:
1. Use one set of wheels...
2. Pop in another set WITHOUT having to make derailleur setup and shifting changes.
For freehubs that is accomplished by the following:
1. Making sure the distance from the center of the drive side flange to the end of the drive side locknut is the same. (Typical 8/9 speed is 48mm)
2. Making sure the distance from the center of the inner-most cog to the end of the drive side locknut is the same.
3. Making sure the distance from the center of the outer-most cog to the end of the drive side locknut is the same.
3. Making sure the same cogset speeds-wise is used.
=8-)
__________________
5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life