Splitting Multichannel in Audition

Hi everyone! I'm wondering if it's possible to split a multichannel wav (poly wav), when it's already edited and put on the Multitrack timeline as a multichannel. Should be possible, right?

So to give an overview of the situation: the client recorded polywav on their Rodecaster, dragged it as a multichannel in the Multitrack timeline and started editing. Now I need to split them into the 5 seperate mic's they recorded, to do some proper post production. I can get the seperate mono files in the Files browser, I know that, but that's just the complete unedited file. I can also choose to 'make an unique copy' and then drag all the new mono files in, but I lose the handles. I can export as OMF and import in Nuendo (which is capable of splitting it) but the OMF will just turn the multichannel into a (two mono) stereo file. Not helping there either.

Isn't there just a simple 'right click clip > split multichannel into mono files'-option? 

Thanks!