Disclaimer: My story is SCTA/BNI rules, not BMST, so don't necessarily consider this as gospel.
Nancy rode the ZX14 in P/P 1650 and just barely could get her feet properly planted on the ground. The bike's clearance was the item that would be measured as well as seat height, with (we assumed) most emphasis on correct clearance. We substituted a very soft cushion for the factory seat and gained about a half inch, and some more by narrowing the sides so her legs could better get her feet to the salt.
No issues in inspection before running or in impound.