Yeah correct Neill, duel regging is the only way to ensure the safety of your solenoid.
What you need is the Angel Air and a Max Flo Vertical Reg. All Max Flo Verts are the same, as they do air and co2 like the stock max flo.
However, try and grab a max flo vert on classifieds, as they can be expensive new. Also, make sure you have a few bits like the correct loctite etc.
Fitting is easy, and there are loads of support for this process.
Check out
http://www.impulseownersgroup.com if you haven't already.
Hope this helps.