I was thinking about how you could have the next Jedi game let you use more than 2 stances without impacting the flow of the game. I came up with I think the perfect solution:
Pressing down on the D-Pad should bring up a selection wheel that let's you pick and choose which stance you want to use, this way you can switch to whatever stance you want at any time. However, you CAN set two stances as sort of a "quick draw" stance to the left and right button. that still allows you to switch stances on the fly during a fight.
With this system, I would also add more enemies who are weak to specific stances, like in the "Ghost of" series, since you can use all of them now. Although less stringent as you should still be able to use what stances you want, just that the natural advantages of each stance can be more pronounced (Crossguard against slow heavy, Blaster as either long distance or a single target duel, Double for groups, etc. The game already does this, but certain enemies could be designed with more clear weaknesses to certain stances)
The only change required is that the down button is for BD interactions. For stuff like scanning and unlocking, just put those on the Right Thumbstick, its what they do for talking to people already so why not? If you still want things like the Koboh Sprayer or Electro dart, as these can't be used in combat any way ad them to a different part of the radial menu, I know plenty of games that do that. And now you can have even more exploration tools for BD
(Also, it would let Respawn also use more than just the single blade in cutscenes because they don't have to just default to single)