Lightscimitars & Lightsaber Variants

[Cavalry King]

Lightsabers get and keep their shape by the magnetic grip of the emitter matrix and a force containment field. If one was to elongate the Emitter matrix and vary the strength of the field down a handle, The nonuniform field might hold the plasma beam in the shape of a scimitar.

Because the Emitter Matrix also determines the length of the blade. You vary the strength of it along a series of emitters, you could gradually change the length of the blade along a axis to give yourself a nice arch. I mean, lightwhips and Lightclubs are possible so I don't see why this couldn't be.

Emitter matrix uses a magnetic field. usually Magnetic fields are uniform. You alter that and that changes the length of the blade. Now if we call the length of the blade the y axis,
put the emitter matrix on the x axis (making it "wider") you could change the width of the blade, theoretically. So you just put that on the side of the blade, or along a curved edge, and you might be able to adjust the width piecemeal so that the blade arcs.

[Vex]

According to the Wookiepedia, the lightclub is just an enlarged version of a lightsaber for those Force sensitives that are large in stature. As for the lightwhips...I think they actually had a core that the energy field was based around, which allowed them to have the damaging property of the lightsaber and the action of a whip. It's not a straight energy blade.

Dual-Phase sabers are said to have the ability to adjust the beam width.

Maybe you have something basically along the same lines as a standard vibrosword that gives the curve for the field to follow so, when activated, you'd get the scimitar effect... *shrug*

[Cavalry King]

I wasn't aware dual phase allowed you to also adjust the width but that is likely because it operates similar to the way I described above. But yeah, put it on a curved edge and then it might work.