But the guitar itself, the way Chuck Berry played it, was like a synthesized horn section. CB's tune Memphis, Tennessee, the melody and the rhythm are taken directly from a tune by Tommy Dorsey's big band, and CB's guitar is meant to emulate the big band horn section.
Robbie Krieger in Soul Kitchen used the guitar to emulate a James Brown horn section in Soul Kitchen.
But no, I can't imagine Keith or even Ronnie trying out a guitar synthesizer--probably they wouldn't get the same "feel" for the music. That's something Mick might do. Maybe there was something to that effect in Might As Well Get Juiced, in which there were a lot of production values involved, but no, not in the Stones. If Chuck Berry had played a guitar synth, then Keith for sure might be into that.