Hi Frijj,
what kind of parametric do you have in mind? Full param (freq/gain/Q) or feq/gain only?
Most guitar players don't really know what to do with a full param, as I experienced in many situation. That's why we put a simple 5-band EQ just to fix some big issue in the spectrum.
The job has to be done with the miking IMHO but as I used on a daily basis a multi-band compressor and/or a parametric EQ I can understand this need.