Playing like a guitarist is just one of those things... You either can, or you can't. Guitarists have all kinds of weird voicings and techniques that are utterly alien to keyboard players, and you have to study them pretty hard (helps if you already play guitar well) to learn what NOT to play, primarily...!

Get that part right, and you are well on your way...

(BTW, guitar synthesis is NOT my forte, so I stick to using the real thing whenever possible!)