Feather spinners are very common, you just don't get to see them at the HW live events, but I can assure you there are more than you think :-)

Sadly the NTM 5060 that Maddox uses is no longer for sale. However you can get the NTM 4258, and that would be more than enough to spin a 2kg weapon on a 4:1 ratio, maybe even 3:1. Use the same ESC and you are off. (Just be careful!)

I personally use a Scorpion HK 5020, cos I am crazy, and my Dad's machine has a Scorpion 4035! But you will find many motors that deliver around 2000-3000W in use.