Purifiers for one. Sneaky, hard to hit. I’d back them with Angeronas. Again, sneaky, hard to hit - but with more focus on dealing with infantry, infiltration and sabotage.
Lastly. How about the Hurricane P17.
This is basically a clandestine assasination suit with a very big gun and Clan equipment designed by ComStar and handed over to the Republic on the downlow.