Is WP really the best secondary for AV soloing? It doesn't strike me as the best choice against single targets that deal massive alpha.
If we are to die, let us die like men. -- Patrick Cleburne
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The rule is that they must be loved. --Jayne Fynes-Clinton, Death of an Abandoned Dog
"Best" depends on a lot of factors and it's not really important to the OP's question.
It is certainly very "possible." Personally, I'd focus on typed defenses and add a lot of smashing/leathal defenses from kinetic combat IOs and anywhere else you can squeeze it in. It's possible to build willpower to soft-cap all 3 of the standard typed of defenes (smash/leth, energy/dark, and fire/cold). You can take advantage of your additional recovery and run a lot of pool toggles to get there.
I gotta make pain. I gotta make things right. I gotta stop what's comin'. 'Least I gotta try.
I'm looking for a MA/WP high level efficiency build geared towards AV soloing...if possible.