With the DLC customiser and the 850 CoA you can simply changed the name and the sigil (lots of Stags, wolves, dragons, flowers, trees, birds, horses etc etc).
I always change Brandon Snow's dynasty when he inevitably marries Sharra Arryn (Aegons conquest start) and has children. White wolf on a sky blue background, House Arrstark. Because... I can't think of a better name.
The same can be done for Jon "West" just give him a new name, new sigil. Job done.