One possible 'mod' of the Talisman is to make it really HUGE (100kt or more) and expensive and make it an 'area' effect device rather than only the ship it's on. Do the facility combat modifers work on components? For a whole fleet? In other words, a 'portable' death shrine.
That would make the 'Talisman' essentially area effect ECM/ECCM. This would let you have some advantages, but balanced with a vulnerability (if the enemy gets to that one ship and poofs it, you're advantage is gone.)