The best would be to have custom clip names set in the P2 XML (UserClipName). You can do this by using P2CMS but also a simple XML editor can do it if you are aware of XML.
Our software MXF4QT Import in combination with P2 Flow CM can map the user clip name to FCP clip names while accessing the native MXF assets. Beside this P2 Flow CM maps all the metadata over to FCP. You find workflow documentations and movies in the SERVICE – DOCUMENTATION section on our website.
Not sure about the Media 100 but if this one can access the native P2 MXF as well then the FCP XML to Media 100 transfer should work.
P2 Flow CM is not part of the free MXF4QT demo. Drop me an e-mail if you want to test this and I can send it to you.
Best
Bjoern
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Product Manager
MXF4mac
https://mxf4mac.com