Howling Griffons bikers

My latest project is just about finished.  It's a squad of 5 bikers with a Power Fist and 2 Meltaguns.  The Meltaguns were spare parts from my Centurions and are mounted on the front wheel, a bit like the FW Legion Outriders.

My original idea was to give my Master of the Forge some protection, but I'm now planning a biker Captain as well to make them troops.  A mounted Command Squad with an Apothecary and Storm Shields is also very tempting due to its survivability,  if expensive.

At the moment I can't quite decide on what chapter to do any more bikers.  Whilst Storm Lords allies would look good with my Griffons, and are White Scars successors, a homebrew chapter would be useful.  I could choose any doctrine I needed and so this would be more flexible.  For now I may well just stick with my Griffons and just get a couple of decent bike squads, probably with more grav weapons to hunt MCs.