Prince of Dol Amroth, Forlong, Sword of Morthond are all examples of the sort of thing that could/should be done with Outlands -- because they don't boost other Outlanders, they do nothing to ramp up the arguably overpowered core mechanic, and if you're using resources to play those *instead* of the non-uniques you're going to come out behind. Gondor/Outlands uniques would have unimpressive base stats but a useful ability -- and a discard ability would be fine, since Men of the West would work with them (and now Knight of Belafas helps them out). The goal wouldn't be to ramp up Outlands, but simply to provide more Outlands options in the form of allies that might be useful outside an Outlands deck.
While there's been little explicit Outlands support since Heirs, a few of the recent attachments might be of interest to Outlands deck. Although the "warriors" and "knights" get no keywords other than Outlands, Squire's Helm, Round Shield and Valiant Determination can go on any ally, Warrior Sword can go on Knights of the Swan, and Ancestral Armor can go on Warrios of Lossarnach.