The topic gets raised every time that a mil and civi aircraft cannon into each other, which sadly happens from time to time. In most of those occasions to date the mil aircraft has been a FW I believe. TCAS was certainly raised when a Tucano and police AS355 collided, fortunately (and remarkably) without loss of life or injury.
My recollection is that TCAS was actively being considered for some of the military machines that travelled at high speed and low level. The pace of any change is unlikely to be high, especially now. On a risk basis, mil helicopters would be some way down the list as Mk1 eyeball is not a bad system for two pilot helicopter ops (unless the bandit comes at you from behind). In contrast, the Tucano pilots did not even know they had had a collision with another aircraft (putting the incident initially down to a possible bird strike, as I recall).
I am sure that Crab's advice is the way to go in your situation.