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@gbj_tester
You can do it with the depth guage of your vernier caliper, use the outer diameter of the rim as a datum then take depth soundings to the bead seat and the spoke bed. Since the bead seat is a known diameter (622mm for 700c), the rest is simple arithmetic. This method doesn't need to account for non-circularity of unbuilt rims, and the errors will be part of small measurement; where 1% error on a full rim diameter measurement will be wrong by enough to make the wheel unbuildable, 2% on the 10-30mm depth measurements will be of the same order as the granularity of spoke supply.