You can create the pattern with 2 guitars one normal and one muted with 2 tracks in Realband you could also do in in Reaper you can mute beat 2,3 on one guitar and un-mute 2,3 on the other, using Direct Input guitars then add the FX to the output.

If you had RapidComposer you could easily do it with the Strum Pattern Generator, I could make up a track for you if you get stuck wav or midi: