Piggybacking off the Zombie thread, how about this:
Three ball game; one ball to be play each of these three ways:
1 - One handed
2 - Cross Handed [“X” style] while standing in front of the game
3 - Straddle-Cross handed standing beside the game, viewing it upside down [or if your arms aren’t long enough, from off to either side]
Which ball is played which way could be decided in different ways, too. Could do a preset order for everybody, e.g. the one above or some other specific order. Could do die roll for random order of which sequence to play them. Could allow high seed to choose the sequence. Could even do a die roll and allow repeats, i.e. roll for each ball as to which way to play it so you could do one of these twice or all three balls. Could even allow each player to choose their own sequence, e.g. one could play 2-3-1, one choose 1-3-2, one choose 1-2-3 and one go 3-2-1.
One benefit of this format is it would be full 3-ball WPPR points.
If you allow players individual choice of order, I’ll bet not all will do the same, and some would even probably vary their choice of order based on what machine they’re playing.
Get really wacky, require each player to play 3 balls each way in a 3-game round, but they can choose which balls and on which machines they do each. Some might play one entire game one way, e.g. a slowish EM or SS one-handed, a DMD straddled and a Stern X-style, or maybe play all three games’ ball ones one-handed and mix up the other two.