I was reading this guide: http://www.evilgamer.net/forums/showthread.php?t=50 And he says you can hand in the item, then get an invis before you click trade, and it should work. Do you think that would work here?
it doesn't, you should do the first step of the shaman epic on your SK to reach indifferent to truespirit. This gives you enough faction to not need the invis hand-in mechanism. It's easiest to have a bard or enchanter charm the spirit in butcherblock and then charm bondl for the hand in.
I completed the SK epic on Al'Kabor as a vanity project and followed this guide through the whole thing - including getting an invis for the turn-ins. So it did work like this on Al`Kabor.
Did this epic on live twice. Every turn in required indifferent to True Spirit. Casting Invis or IvU depending on the mob and conning them to make sure indifferent before accepting the trade is all you needed to do.