I'm not sure this answers your question directly, but I have started to have confidence that my relevant ideas will come back. Indeed, this is a natural filter.

I'm not sure this answers your question directly, but I have started to have confidence that my relevant ideas will come back. Indeed, this is a natural filter. What happens when you don't worry about trying to get them written down? I think this will (paradoxically?) improve your brainstorming, and you might find your brain finds its own ways of integrating your ideas. The above strategy seems to work well when I'm trying "to hold" an inspiring creative spark; e.g. what are the right questions to ask or "what are the key connections or people to make X work?". It might work less well when there are a lot of moving parts. For example, I find I usually will need to draw with pencil and paper when it comes to physical designs or complex algorithms. Also, some ideas about to get your head back in the same creative space where you had the idea... go back to the same place, play the same music, ... the brain's memory is highly associative.