I would say that in an update that allows you to redirect links to your own instance would be great, and I was told I was wrong thinking that would need an extension. Take link, copy to search wasn't obvious for me when I started with Mastodon, but I eventually figured it out.
If I was an instance I would try and find a way to make a FAQ that linked maybe to Wikipedia or something that everyone can update for common questions, and a local community with FAQ posts for anything specific to that instance.