Better Solution for Dual Knee/Elbow Setup(/w Video)

Hello, i just recently found a way to have a dual knee/elbow setup without duplicating entire IK joint chain and extra messy connections. I'm not sure that it's been known for some time or riggers/animators prefer to have that noFlip/PV switching option because i have no experience in the field. Mostly expert topics are discussed here and i don't have much to contribute but all i want is to give it back to the community(if i can). Would it be useful to anyone in this time if i made a video showing how to do it?