It's not really practical or realistic to operate with an "us-vs-them" attitude to the rule book. The rules are designed by the members for the members. If you think a rule is poorly worded or incorrectly written, whack in a submission to clarify it, or improve it. After the commission has reviewed it, the mod will appear in 18 months time in the GCRs, MoMS or whatever it's called by then.
Also, the logbook situation that historic roadracing has adopted, while flawed, seems by and large to work ok, but would be impractical to implement in vmx (let alone the scores of pages of whinging it would generate on here !) It's not the job of a scrutineer to validate what is or isn't period-correct on race day. I believe in vmx, as in historic roadracing, the eligibility for a submitted bike should be determined by others racing in that class. That would soon weed out any dodgy bikes attempting to sneak through later-model components for an advantage, and would quickly result in a level playing field : being judged by your peers, in fact.