Once the Talk Brainstorm subforum is created, I see the sequence of events as:

1. Member creates Brainstorm proposal (along with any solutions)

2. Member captures link of that proposal and starts a new thread in Talk Brainstorm subforum, pasting that link ito first post along with a synopsis (or perhaps the entire text of the proposal as a quote)

3. Member captures link of new Talk Brainstorm subforum thread, and edits Brainstorm proposal to include it. Cross pollination complete!

We could call the new subforum "Brainstorum" (kidding, kidding)