The only way to get a clickable link in the current version of CC is to put the HTML into a comment that is "interpreted as HTML". This means that you can't use a template but must instead use plain text.
What does work is to add both a composite custom column containing the books ID and a comment column interpreted as HTML. You would copy the ID value to the clipboard using the template tester, edit the comment column, paste the URL you want, then replace the ID part with what you copied. I would use constant text for the {title} such as "Edit Metadata". You could set the comment column value for all books using a command line script or perhaps a library-closed plugin if you can write such a thing.
Yes, this is a pain because you must do it for every book, but it gets you there. The ID won't change so hard coding it isn't a problem.
You might suggest to Sam that composite columns marked as "display as HTML" be scanned in CC for links.
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