If you're interested in pursuing the idea of a (YC) startup on the topic still, feel free to drop me a line. See [1] for a bit of background on me. Active Debris Removal as a service (ADRAAS?) is going to be HOT. I know a few companies in the space already, and there are plenty of problems to address.
[1] https://news.ycombinator.com/item?id=8573800