I think the two ways most likely to trigger an HN discussion on the topic are:
1. Build a prototype and post it as a "Show HN". This has the advantage of moving toward the desire to write one.
2. Post an interesting article [or articles] about the topic.
A variant of 2 is to post a self-authored article[s]. Writing articles probably has the advantage of furthering understanding of the problem more so than just reading about it.
Writing about or prototyping are more likely to produce previously unconsidered technical information than a question because of the internet's natural tendency to produce 'You Are Wrong' comments.
Good luck.
