I made some profiles of the tc bodyrez and the Audio sprockets Tone Dexter ... but the best way to get a decent sound is with a selfmade ir or a selfmade tone dexter profile, then it fits perfectly to you guitar.
To to the IR your self you need a Match eq software, voxengo deconvolver, the kemper cabmaker, and a good mic.
Record you piezo signal and your miced guitar (Play bar chords on every fret so you have no gaps in the wave form later)
and match eq the piezo signal to the mic signal with izotope ozone. Now create a 60second sweep with voxengo deconvolver an load it into you daw the the track where the matcheq is. Export it convert it to a IR and then to a KIPR file with the Kemper cab maker... IMO this is the best way to correct the rather plasticy sound of piezo pickups. The fast way is of course: Buy a Tonedexter and profile the wavemap and enjoy it on the kemper together with the effects and looper and so on. The Tone Dexter does basically the same and works wonders imo.