True about the Kettlebacks and Slynts (Kettlebacks were self-named hegde knights, probably didn't "exist" in our times) and Slynt rose to prominence after... well, spoiler, but we all know when. He was a butcher's son, if I remember correct.
Don't know anything about no house Virwel (or Virvel, or Wirwel, or whatever...). Where'd you get that one? I don't know why you'd want the Jast or Risley houses? There was hardly anyone from them in the series, novellas or in-game. Same with Ruthermont... and others.
Houses Tarly and Royce would be great, but yeah - there's an issue with Royces. Tarlys - sure, I'll second that. And I'm all for Tollett as Dolorous Edd is one of my favourite characters
I wouldn't mind seeing house Plumm. There's one in the CDB and we could make a couple more for some marital purposes as well. They've got their arms and the house words given, so it would be easy on that part.