"a cross-licensing type of agreement...perhaps without any exclusive provision so that we do not close other doors..."

Sounds good Gene, I imagine a situation where the combined salesforces of both parties are hard at it in a world that has finally woken up to our dire climatic situation.
Johnson Controls/York is another possibility. Capstone has a history with Johnson, and a former Capstone CEO has history with York - which he probably wants to forget - but I bet he won't mind if his parachute shares go north of $10.