I think I recall someone who was distilling his yeast solution a while back and it worked for moonshine- but I don't think wine is gonna work. I think its got to be one or the other- either the wine comes out good or the CO2 stays relatively constant... not both.
I guess if you had a whole bunch that you would rotate it would work- but you'd need a lot of barrels to age that much wine.
turbo's on the right track. the cycles and duration of Co2 generation between brewing hootch and generating Co2 for your plants may be incongruous so it's better to address both needs separately, than compromise either by trying to tweak them to both work using the same apparatus.