A few saddle entries from guard involve getting a foot inserted and then either inverting false-reap style into saddle or getting your opponent to post their hands and "capturing" the primary leg reverse-x style.

From half butterfly it seems like you could also enter saddle by lifting your opponents hips and then kinda sweeping their feet out in front of them Kani Basami style.

Just mechanically speaking: is that move as fucked up from that position as it is on the feet? Setting aside even whether its effective. I just wouldn't even want to mess around with it if it's gonna make my partner's knees explode.