I agree with RM-MN, don't worry so much about the trub.
I have a whirlpool setup on my keggle and I do whirlpool when using the IC, although it works better with the IC pulled out most of the time I leave it alone.
I had my dip tube going right to the center of my keggle, well almost the center and still left a good amount of trub in the keggle when done racking to the primary. I don't think it even left a cup behind with that setup.
I just made another dip tube and moved it to the side of the keggle, part to leave behind a little more trub cuz it will no longer draw from the center of the trub cone, and part to get the dip tube out from under the IC.
Of course I had this in mind when I was building my keggles and brew stand, the whirlpool moves the wort when I'm chilling and I don't have to stir it, this helps cool faster with the IC.