Craig, sorry you aren't having a plug and play experience here.
The fans are easily remediated. The Inuke uses a 12 volt fan so any computer fan will be a easy swap in replacement. I've modded the fans on several amps and none were easier than the INuke DSP amp.
Here's a fan that will work great with near perfect reviews and inexpensive to boot.
As to the power thing - the Inuke DSP is class D, it uses very little power when idle, and very little power when even powering things - in comparison to other amp technologies. I'd wager it uses less power at idle than one of your submersive hps. I pulled my old p3 kill a watt out to test on mine, but the display is garbled and I think it's dead. I'm leaving it plugged in in case it comes back to life. I bet it's 10 or 15 watts at idle tops.
Now for the real problem --- getting it to actually work for you....
I think you will have to tow with providing it an input off the LFE channel of your AVR - even if only briefly for a test. What model AVR do you have? Onkyo or Denon should be fine to run a pro amp. A Pioneer may not be. Your SMS-1 should be fine I think.
As to the clip lights - that's strange behavior. Are you talking about with nothing plugged into the amp the clip lights come on with the gain attenuators on the Inuke dsp 1000 set to max? If so you have a defective amp. If not, then remove your oppo source and unhook the input and see if it still happens. Did you limit wattage? When you limit wattage your clip levels drop WAYYYYYYYYYYYY down. So if I limit my wattage in the DSP to say 150 watts per channel, my clip lights will come on much before the actual limits of the amp because it is indicating I'm reaching those power levels. I've also noticed that due to a bug or whatever the fans speed up when the clip lights come on which is good because normally at clip you are really taxing the unit - however -- if I limit the wattage my clip lights come on much earlier (NOT taxing the amp) and yet due to this 'bug' the fans still ramp up. I think the fan must be set to ramp up at clip regardless of pushed wattage. That's only a problem with the stock fan. I replaced my fan and I can't even hear the unit now. In fact I don't hear it unless my ear is touching the thing, and certainty have never heard it ramp up since replacing the fan.
Keep working through this - the DSP options you are getting to play with will be worth the fuss IMO.
Heck I didn't even have use for it, and I bought another Inuke dsp 3000 in that amazon sale because I like these amps so much. It's sitting in the box for a future project!