If you change the path to your files, I see massive issues - at least with custom, un-matchable item.
The only way to solve this cleanly is this method:
[Moderator edit:] The description of the alternative method is given in the 10th post below: [HowTo] Plex database modification - Moving media the right/wrong way - #10 by jelwell
People ask all the time about moving media content. I think the reason they ask is because I think this article is misleading:
You can’t move content to a new location and expect any of your manual changes to apply to the moved content. If your files are all named perfectly, then sure, Plex will simply rematch you…