category, plan, drumstick
揆 centers on measuring and sorting things into categories, which extends to planning or scheming. The drumstick sense is a rare, specific object that fits the idea of a hand-held tool for measuring or striking.
揆 combines 扌 (hand) with 癸, which likely contributes the sound and the idea of measuring or estimating. The exact historical development of 癸 is uncertain, but it is associated with the last of the ten celestial stems and may have originally depicted a measuring tool.
The hand 扌 holds a measuring tool 癸, like a ruler or a drumstick, to sort things into categories or plan a rhythm.
For キ, imagine using a key to unlock a plan: key -> キ, and your hand 扌 turns the key to measure out the perfect scheme.
uprising (esp. in Japan since middle ages, e.g. peasant uprising); revolt; insurrection; putsch; riot
Beer Hall Putsch (1923); Munich Putsch
Jōdo Shinshū Buddhist uprising (Muromachi and Warring States periods)
province-wide uprising (Muromachi period)
peasant uprising (Muromachi period)
uprising demanding debt cancellation orders (Muromachi period)
way; method
peasant uprising (Edo period); peasants' revolt
agrarian revolt; agrarian uprising