@DaveNB
Thanks, I've moved your HOWTO to a separate page that is referenced from UserProfiles
https://libprs500.kovidgoyal.net/wiki/UserProfilesHOWTO
That way you can address it directly and the UserProfiles page doesn't become too long.
@JTravers
The behavior of web2lrf is fully customizable.
You would need to re-define the build_index function in your profile to simply return the path to the pre-built index file.