So I actually picked up a Remote Speedy Hat not too long ago, and I'm quite happy. It plays fast and buttery smooth, and lives up to everything that it promises. Worth checking out. http://remotespeedyhat.com/
Definitely do this if your double pedal's shaft is long enough.If I were you I would just use a regular hihat stand and put your slave kick pedal to the left of the hihat pedal.
Wouldn't the shaft interfere with the HH pedal??