Tokina has a cinema line of zooms that come in MFT, but they are made for S35mm sensors. And JVC's LS300 can do their digital zoom in, but you need that specific camera. Panasonic's FZ2500 now has useable zoom motion w/ great range, but the lens is not constant aperture, nor is it fast enough, plus it's a 1 inch sensor. And yes there are plenty of broadcast zoom lenses, as well as C-mount zooms that can work with the right adapter & extender.

Something in the lines of 10-100mm, or 12-120mm with at least T2.1, has to be parfocal, but macro optional.
Kind of like the vintage 16mm zooms from Angenieux / Zeiss / Cooke.

I've been using the Olympus 12-40mm with gears for both zoom and focus, but it's not quite parfocal; was even dreaming of a full Duclos mod like their 11-16mm!