In my experience, having a link in the close reason just leads people to go copy the question they just asked on site A and paste it into site B only to have an equally miserable experience. Even when you make the link point to a lot of guidance on what any particular community looks for in good questions, people generally don't read.
It's okay to link, but do it in a comment along with some other advice. At least 99% of the time, some other advice is sorely needed. This might be a good fit on [link]our travel site[/link], however - [how do I tell this guy her question is a trainwreck?]
Migration paths will be strongly considered once Expats graduates - for now, just continue moving stuff that is off topic here and that Travel SE would actually appreciate with the finesse that you've been using since you started.