I'm not sure I fully understand what it is that you're asking here, but I'm reading your post right, you're asking if you can use Netflix's Chaos Monkey to terminate stuff that's not managed by Spinnaker. Did I get that right?
If so, then the answer is no, Netflix's Chaos Monkey can only work with stuff deployed via Spinnaker. You can see that in Chaos Monkey's official Github repository:
This version of Chaos Monkey is fully integrated with Spinnaker, the continuous delivery platform that we use at Netflix. You must be managing your apps with Spinnaker to use Chaos Monkey to terminate instances.
The way they're using "This version" at the start of that sentence might mean that there's a fork out there that can work with other CD programs. I didn't find anything though...