Cardnial Trem Modification Question

[jambforthelamb]

Hey Guys!
I have an older version of the Cardinal Trem (non-tap tempo) that I would like to try a mod for. I've seen a couple of tremolos that have a second LFO that modules the rate knob so that essentially the rate speed will go up and down etc. I would love to mod the Cardinal to do this. Can I just build an LFO and wire it up to one of the lugs on the rate pot, or would it be more complicated than that? I'll likely try it either way, just wanted to put it out there to the committee XD.
Thanks!
-Kevin