This has probably been suggested already but two sticks a la Arnis would be boss. I guess it would be somewhere between Talim and Cervantes, though maybe a little less fantasy. Solid mid range, very fast, but shit damage. A big focus on dodging and parrying moves.
I liked CotS too. It would be fun if they implemented that special armour stuff and made it a real RPG. But as been said, I wouldn't trade a sliver of quality in versus for an entire campaign.
I think a positive on block 4B would be sweet but I think that it would be even sweeter with some stance transition on top. Blocked 4B means free GS transition. 4B on hit means free GSB or at least GSKK. It's slow enough to be ok.
Also I'd like 2B+K to track 100% and maybe make WRK completely...
I'd like an updraft fakeout/cancel. I experimented with empty updrafts and that was a lot fun, and really useful as in my opinion Tira has a lot of trouble against long ranged characters, but after people get used to it it's garbage. Make it so that they have to commit to stuffing it on reaction...