Classes
Hybrid skald (bard, Heroes of the Fey WIld) Every other variant class has it's own hybrid form. Also a feat for skalds
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The class has the same details as the hybrid bard, except:
Skald's Aura replaces Majestic Word, and has the same hybrid restrictions.
Master of Story and Song replaces Bardic Virtue.
Daring performer [arena fighting] (d368, bard HotF 59): When you would use a Skald at will, you can make a Bluff check to gain combat advantage against the targetted enemy until the end of your next turn as a free action. You can still use Bluff in this way only once per encounter.
Two, monks can already be "single target strikers" (it's called "Desert Wind") and be enabled (Stone Fist/Eternal Tide, Internalize the Basic Kata, Babau Gauntlets).
Monks scale terribly badly with their existing single target damage
Desert Wind is a thing that exists. Full stop.
and had to choose between single target and multitarget damage feats, with this at will and implement focus they can do both now.
This was never a problem. Don't try to fix what isn't broken.
Monks combine well with executioners and scouts. 
Also, I've added ideas to help psions maintain effectiveness while diversifying with other classes.