Thanks to everyone who provided feedback.
At the start of this process, I did have a vague recollection of a Kodi addon to manage TVH. I remember having installed it once, but for reasons that I can not remember, I uninstalled it and went on with my life.
I tried to install tvh2kodi again yesterday, but it crashed because of a deprecated Kodi function. It seems that it has been updated for Matrix, but not Nexus. tvh2kodi claims to have a setup wizard, so if that can be made to work then I need not continue with my idea.
I took a quick look into the tvh2kodi bugs and I fixed several problems. However, every problem I fixed just uncovered a new one until it lead to a problem with an external dependency so I stopped there. I think that tvh2kodi needs some remediation to get it working again.
Unless the ‘PVR Setup Wizard’ is either part of, or run from, the LE ‘First Run Wizard’, then its value to end users is reduced. If the user needs to finish the LE wizard and then load a Kodi addon manually, they may as well just load the PVR back/front-ends of their choice manually and get on with their day. I have no interest in creating an LE fork just for that.
I need to reconsider my approach. If tvh2kodi can be revived, then that is my referred option as it already has the functionality that I proposed for the TVH part. Perhaps it can be modified to detect that it is running on an LE system and adapt accordingly, or, perhaps if there ever is an LE ‘PVR Wizard’ then it can call the tvh2kodi wizard with a parameter.