I, unfortunately, have no interesting tales to tell about beating the Sidhe, mostly, because it seems that they've stopped really caring about what happens in Ulm. They're still trying to avoid my large army of Black Knights, as it seems they fear death very much
. By now, I think all of the O'Giantslayers have vacated Ulm, likely going on to greener (likely soon to be redder, one way or another) pastures which do not involve Black Knights or Arbalests (which are surprisingly effective if the Sidhe get in range).
Finally, I can't really think of any Werewolf ideas that actually work, due to not having much time and also being a newb. However, I can suggest prying a Frost Brand from the cold dead hands of a Sidhe (preferrably an O'Giantslayer) and then giving it to a blind werewolf. If you can get one, an Eye Shield would be nice too (but if not, a Vine Shield works just as well). Less because it would work against the Sidhe and more because it would be fun to give them a taste of their own medicine and/or watch how well-prepared they are against Eye Shields and Frost Brands (in fact, you could probably sneak around Sidhe lands too if you happen to have a spare spy or the money to get one).
One last thing: I do plan on at some point, for however brief a period, owning the Forge of the Ancients. Preferably not by going to war with Agartha.