dds, welcome to the forum. I agree that the "Prop Alignment Slider" (sword) is a bit awkward at times, but some of its disadvantages can be mitigated. It can be secured to the motor or boat via lanyard and snap hook and can be stored in a simple scabbard (using canvas or brackets) that you can fashion and secure to the side or front of the cockpit. Best of all, it is simple and foolproof -- it is easily replaced/repaired if lost or bent.
If the prop gets fouled by seaweed or otherwise jammed, the cam concept may not work, preventing extraction and clearing. Likewise, if the cam got out of phase with the prop, you'd be doomed.
A lever mechanism may have possibilities if feasible, non-interfering with the handling of the motor, and shielded from bending -- would have to see such a device.
For most users the motor is inserted and extracted once per trip, so the inconvenience of the sword is not a constant annoyance. Last but not least, it's good to have handy in case of a pirate attack!
