Since Bard and the Bow was published, I have been thinking of a two-deck that can keep threat low and sniper the staging with Bard and Legolas. I think it is quite managable but I have been on a gaming break so I cannot tell from experience. In theory I like this very much. I used to run Dunhere a lot but Hands Upon the Bow and Great Yew Bow can quite step in his shoes I feel. And whilst you keep the threat low, Unseen Strike is an effective boost.
I like the idea. There are some enemies that are just really hard to keep in the staging area (Zealous Traitor, 17 threat. Tentacles! 12-18 threat each. All the little 15 & 20 threat Goblins in Khazad-dum). But if you can keep your threat under 25, you can make this a pretty viable strategy I think. Bard (11), Legolas (9) with a Great Yew Bow, and Dunhere (8) is tempting (starting total 28), but Glorfindel might be a better choice (5) for a lower starting threat (25). Secrecy is tempting, but Bard and Legolas really won't work as a 2-hero secrecy deck, especially in solo play (all Tactics - no threat management, no Secrecy cards even).
Bard, Legolas, and Glorfindel lets you put in Elrond's Council to keep threat low. Without Leadership, though, you'll have to forego Sneak Attack + Gandalf, which seems like a no-brainer for a deck trying to keep its threat low…. Maybe Bard, Legolas, and Theodred (8) for a starting threat of 28? Still high for what you're aiming at… Glorfindel it is, then, with Song of Kings in the deck! I must have my Gandalf!