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mybud – Just a point-in-fact . . . . R23 is the point where the overall circuit’s LFO is connected to the FETs. And TBH, I’m not sure if one would want retain the value of R23 and use it as the injection point – OR – bypass R23 and inject the CV where R23 connects to the FETs. Were I to tackle such a thing, I venture a guess that the high value of R23 suggests it is a current limiter and I would first try the injection at the bottom of R23 (as seen on the schematic) and thereby disengaging the internal LFO section.
As for using the guitar\source signal as the LFO rate, I surmise it would indeed emulate a rather gnarly ring mod. For that, I would perhaps toy with using only one or two of the phase FETs for that option.
Have fun and good luck!