That is a tough situation. I would also raise the diptube, tie a nylon hop sack around the end, and attempt to transfer to another keg. You'll need to make a jumper to go from out post to out post, and make sure the receiving keg is sealed when you start the transfer, or else it will foam like crazy. During the transfer, burp the receiving keg every few seconds by pulling the relief to keep beer flowing.
Hopefully the bag filter does not clog up. Might sound crazy, but if I were you I might actually invert the keg first to get the pellet material in suspension, rather than all at the bottom where it might immediately clog the bag. It may still, but perhaps you could get most of the beer transferred before the beer/sediment level drops low enough to clog.
I don't know if you could do the transfer with the bag on the receiving diptube, to "catch" the hop debris. Depends whether it gets clogged going through the diptube/poppets/posts on its way to the receiving keg.
Like sweetsounds said, I think serving through a filtered diptube might be disastrous.