There have been companies in the past who have made a sensor pick. It was never wireless and did not do much and was big. I have had good success with sensors in the guitar and will be pursuing this later in the year.
How horrible would a wired pick be to you?
I can't recall if I have seen pick system but have certainly seen many different 'almost' controllers.
I have thought a bit about what I might want/what might be possible in this way over the years. certainly some of the KBow functionality made it on the list. I have seen some open-source uni projects that would help.
As to the wired pick,i I would adapt I think; and given the potential cost of the hyper-pick you probably don't want to lose it, either. And that also provides a means by which you can remove as mec electronics as possible from the sensorpick - hmm a few more ideas - wheres that drawing board.
KMI StringPort_1650, SoftStep_VK2 v1.2 & MIDI Expander; Mac_Moore Guitar,
Roland VG 8, 88 & 99, YamahaVL 70m; OSX 10.6.8, iMac i7 2.8G QC; MaxMSP 5.1.8, Ableton Live 8.2.2, M4L, SC3, QC, cSound, etc, etc,