Great discussion that looks at real world issues for convergence shooters. Thanks, once again, to Gibby for the time he devotes to these subjects.
My bias is toward a PL mount S16 zoom for Tim and here's why: a more direct optical path (the B4 and converter is a kludge full of compromises for a single plane sensor), DoF that suits run and gun, used Angie zooms are easy to find in Tim's price range, with the right rigging it should allow servo control with the RED control grip - if that is too pricey or seems like too much of an add on then just practice using the manual zoom ring on the lens barrel MAKE SURE YOUR LENS IS CLEAN AND LUBED OR YOU WILL HATE THE MANUAL ZOOM.
I know that the rocker type zoom control is probably your comfort zone but unless you need a slow silky push or pull the manual allows quite a bit of artistic control - snaps, presses that pick up speed with the action, etc. For the stealth stuff you can just frame up and then roll.