I don think its a good idea to have Stealth Rock on a Choice Band user, even one with Switcheroo, for below reasons. 1.If you use Stealth Rock before using Switcheroo then you are locked into a non attacking move and give your opponent a free turn while you switch out.
2. If your plan is to use Switcheroo then Stealth Rock, it is not easy to get 2 free turns with a fragile mon like Infernape, especially in doubles.
3. You also dont have a Fire type STAB move and are helpless against opponents that resist Drain Punch. This makes you a really ineffective sweeper because your sweep gets stopped by any fighting resist.
I think you should just run Fire Punch or Flare Blitz instead of Stealth Rock. You can just put Stealth Rock on a different mon that can afford to fit it into its moveset.
Also consider running Close Combat over Drain Punch for higher immediate damage.