How about this:

I Am No Man
![Rohan [Rohan]](https://lotrtcgdb.com/forums/Smileys/classic/rohan.png)
Event • Response
If a skirmish involving a non-unique
![Rohan [Rohan]](https://lotrtcgdb.com/forums/Smileys/classic/rohan.png)
Man is about to start, play Eowyn from hand to transfer all cards and wounds borne by that Man to Eowyn (without paying their twilight costs), have Eowyn replace that Man in the skirmish, and discard that Man. Eowyn's twilight cost is -2.
EDIT: No this isn't a serious DC (it's not too useful), just my take on the whole companions-replacing-companions thing.