Since, you're converting from FTView, I'm going to guess that your devices are also AB. In which case, there are some pitfalls to avoid when creating tags. See this discussion, it is a long read but very much worth it.
Also, see this thread for some best practice tips.
All good things to know.
As for you're other issue, if you want the operators to have an Ad-Hoc charting capability, then IMHO renaming the tags is probably the better solution. You can export the tags and then with a CSV file or some other means of connecting the old name to the new one, edit the names in mass, and then reimport the tags. I think that there are some examples of this floating around the forum.
Perhaps @nminchin has something he is willing to share?