This question already has an answer here:
Existing SE sites have a feature that suggests what tags may be appropriate based, perhaps, on comparing keywords with existing tags.
I just had the thought, having had a few times where I wanted to ask SE a question but wasn't sure where to put it, whether it would be possible to make a meta-site where you start typing in your question and, instead of SE suggesting tags, have it suggest links to individual SE sites.
Possibly this could have a default option, if the OP does not select any of the suggested sites, being posted for the interim to an interim.stackexhange.com site, where every post is flagged for moderator attention for migration to an appropriate site with the moderator adding a comment of "I moved your question to _________ because it fits the site for this reason: __________"
Would that kind of thing be possible and/or desirable?