I’m not gonna post my design in case it gets me disqualified, but it is a straight cruciform sword like you describe because I had the same thought. A little variety couldn’t hurt. It’s the only 2h sword DPS in the game, it should have more options than just katanas and a handful of sabers. Hopefully some other people submitted something similar and one of them gets picked.

My character is a knight-errant from Ishgard who trained as a Samurai after leaving to explore the outside world following the conclusion of the Dragonsong War. I could totally see him forging a new custom sword to adapt the techniques he learned, sort of like an estoc sword but designed for both slashing and thrusting attacks. Like how Happy Gilmore putts with a hockey stick.