Show HN is meant for people that build a thing. It's not meant for incremental features. However, I'd say this counts as a 'new thing', not an incremental feature, so I think it should be allowed. At any rate, I'm happy to see it, and I think it meets the bar as compared to most Show HN's I've seen in the past.
Welp, sorry it got taken down in the end. At any rate I feel it's significant enough effort to earn a space on HN one way or another -- maybe worth submitting through the 'main channel' if people really don't feel it belongs in Show HN.