I'm not sure I got you right...
Did you do a multitrack recording in Reaper and mix it down to the "studio" version of the song ?
If so it should be easy to do a mix while muting parts that are to be played live and use this as a playback in the show. You don't even need to take a computer with Reaper to the show.
Regarding "firing" your backing track(s) while on stage, you should first decide what kind of controller hardware and workflow you want to use.
-Michael
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