Many of the questions on Stack Overflow with hosting belong on Pro Webmasters or on Server Fault. Is it OK to edit the tag wiki to say "if you've used this tag consider putting your question on these sites..."? There would also need to be a quick explanation of how to decide which of the two.
What is meta?
- Any Stack Exchange user can ask a question
- The community provides support, votes on ideas, and reports bugs
- Your voice helps shape the way Stack Exchange operates
It seems quite appropriate to me. Many tag wikis contain instructions about how to use a tag and when to consider using additional or alternate tags; redirecting to another SE site seems a natural extension of that.