[LAU] Possible to have realistic guitar strumming sounds using my keyboard?

[Ng Oon-Ee]

Hi all, while my Korg keyboard does a pretty good job of imitating the
sounds of various instruments, I can never seem to get the guitars to
sound like they're being strummed. In my (simplistic) estimation its a
matter of rolling the notes consecutively from low to high (down-stroke)
and then high to low (up-stroke), perhaps needing variable pressure on
different notes?

So my basic question is, how would you produce as realistic a guitar
strum as possible using an electronic keyboard with the requisite sound
banks? Or should I give it up and just record my guitar directly (neck
needs straightening...)?