Perhaps the filters are loose around the word “funding” but restrict unrelated topics.

Id generate a tag cloud of related concepts where anything that mentions that topic is ok in the parent note. Replies could be more relaxed perhaps?

I know it’s not perfect but with enough tweaking and good UI / etiquette you might get to a decent state.

I think the main thing is just to launch this and work through the kinks until it more or less works as intended. No doubt you’d run into interesting dilemmas and edge cases, but that would be a fun challenge .