On SE I once proposed something to help the OP re-ask the question without all the cut/paste -- basically, show the on-topic info, user says "yes ask there", and we open the "create post" interface on the other site with the existing content pre-populated. There are some complications that have to be dealt with, like the user not yet having an account on that site, but if we want to go down this path I would explore something like that. If we have migration, make it less confusing.

The problem is that the poster is doing a copy/paste on the different site. Just the other day, I told someone that their question was about electronics, not programming, so it should be asked on the electronics site instead. I specifically told them that part of the question was a buying/tool recommendation which would be off-topic on either site, so they should leave that out or edit it into shape. After which they copy/paste the question as is on the other site anyway...

Closing and making the OP repost is a little tedius. That's good. There needs to be some cost to posting in the wrong place. And, the question shouldn't just be copied exactly to the new site. It should be looked over and edited for the different target audience. Most likely, something should be worded differently, domain-specific jargon adjusted, etc. If the OP goes away instead of doing this work, oh well. Those are not the kind of users that will be a positive contribution to the site.