having done a few Trials events this year,
Trials is very uncomplicated by comparison to VMX and the only real anal folk seem to be some of the old school brigade and even then its still very simple.
so i'd reckon if the bike/forks are not 100% perfect to the year but still fit into the broad guideline of "post classic" or "twinshock" (same thing) then like Doc has done, it'd be fine.