Removing fixture from library of existing show

Is there a way to remove unused (i.e. will never be used) fixtures from a show's fixture library?

There are a ton of obsolete fixtures I know I will never use so I would like to remove them to clean up my fixture library to make it easier to find ones that I will use.

However, it's always been my understanding that you can append to a fixture library, but not delete, even if you properly update the fixture count.

Is there possibly a work around? Maybe create a new show with the library and then import palettes, cue lists, etc, or will that still drag over all of the fixtures from the old show library?
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