(Have you also looked at Autodesk Motionbuilder for this pipeline?

Essentially my workflow is motion capture -> re-target bone animation to HIK2016 rig and save to my already extensive library of HIK2016 motions. 
I do all my complex and multi-character animation in Motionbuilder. (Better animation tools than iClone and easier Story mode compared to Maya Track Editor)
I can then bake any animation to the bones of a character already characterized in 3dxchange, export the character and motions to 3dx and export them as rlmotion or imotion. 

I have Motionbuilder / iClone 7 / 3dxchange / CC3 as this combo is far superior to iClone 8 / CC4. 
IMHO a way better use of my money. 
Hey if you can afford it, throw Maya into the mix as it works well with Motionbuilder. (There are student licences available for both. )