Air command punish, its harder to time but very possible. I wouldn't always recommend it.

Meaty dragon fireball after 2L rekka combo, can be useful if you don't spend ex meter.

Meaty dragon fireball after regular rekka in the corner, links into cl.H

Another option if Kat likes to fish with far C.

TEIYAH

High/Low options off wyvern is nice

Oki into throw combo

low into overhead off ex dp dragon oki

Dealing with clM pressure on Kat. One option.