This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 攓 is uncertain. It visually contains 扌 (hand) and 蹇, but the component relationship is unclear.
The hand radical 扌 suggests an action, but the overall meaning is unclear. Think of it as a mysterious hand gesture.
For ケン, imagine a hand making a mysterious gesture that looks like the letter 'K' and sounds like 'ken': K -> ケン.