Whether or not you actually are is secondary to what they perceive you to be...I think any Sith seeing you and your horse, for instance, would be lulled into a very fatal and false sense of security.

[She ponders the latter question, though.]

DEMP devices. Destructive electromagnetic pulse weapons. He relies on a life support suit, these could disrupt his systems enough. Beyond that, engagement with flechette launchers or slugthrowers - they would be more difficult for his lightsaber to block or deflect.

[Oddly enough she's put some thought into this, previously, with updates now on the train.]