Tad, you seem like your quite a few steps ahead of everyone else!
Why change the inductance though?
Why not just use fixed inductors and change the frequency using electronics like you mentioned.
I have heard of several people who have replicated the following circuit of Stan's and they have claimed that it worked. From what I understand the circuit is used for resonant frequency locking.
(http://i51.photobucket.com/albums/f389/xbradkx/mEYERSCOMPLETECIRCUITS.jpg)
Have you tried this circuit?