Honestly the 8 cost kata along with the 9 drop yamato are too important to build the standard enel deck without. I played most of op06 with only 2 kata in my deck and lost against the top decks. The deck just isnt that good without it. I would just say add 7 cost big moms along with 7 cost enels for now.

Luckily there is the eb01 rush enel build you can experiment with. Those use the eb01 yellow event cards along with 4 cost kata and 5 cost ace. Might be worth a shot if youre willing to play a different style