Haven't heard of anyone doing that but doesn't seem worth it for several reasons.
1. You'll probably get a crazy amount of vignetting do the fact that those lenses are at most trying to focus onto a 2/3" chip and not the much bigger ones found in even cropped image sensors of DSLRs.
2. Photo lenses from nikon or canon and cinema style lenses from companies like Cook can resolve a lot more resolution then an ENG lens.
3. Even if you could adapt it the advantages of autofocus, servo zooming etc of a broadcast camera lens would no doubt be lost during the process.
Might be worth it to sell to someone like broadcastbaron.com or even put them up on Ebay