Interesting, will have to try that. Actually, thinking about 3 hand hold 'em made me come up with this:
Split Personality
Players are dealt 4 cards which they must split into two HE hands, keeping them separate into “Left” and “Right” hands.
Playing/betting proceeds as normal for HE (flop, turn, river), best 5-card hand out of hole/community cards win (can play the board), but at showdown best Left hand takes half the pot, and best Right hand wins the other half.
Optional: Player chooses which hand to play for first and second halves of the pot at showdown before the reveals. Do you pick your stronger hand first or second?
If there’s already a similar hand to this let me know.
Edit: I guess it’s like SOHE or SHESHE, but since the two hands are the same game the optional element of being able to pick which hand for which showdown hopefully makes it different enough.