The US Navy F/A-18C lot 20 doesn't have nav receivers that are compatible with ICAO ILS and VOR, so judging by ED's goal of highest possible system accuracy, I'd say no.
Not yet AFAIK, but seeing that TILS beacons for the Viggen were added, I see no reason why ED couldn't do the same with ICLS beacons for the Hornet.
Avionics are bulky. More large heavy avionics = less fuel and/or payload. If civilian navaid compatibility isn't seen as usefull enough, other things are given a higher priority.