I've seen kinkmemes in the past where things like forgotten prompt posts were made, where people could re-prompt an old prompts they were particularly attached to and hadn't gotten any love. Those were mostly in bigger fandoms so I don't know whether something like that might work here, but it's worth keeping in mind.
(Also, as a very slow-moving writer, I have a word doc full of old prompts from further back in the km which I am slowly but surely getting around to filling... here's hoping your prompt is on the to-do list of me or somebody else, and you get a fill eventually :D