What is the destination for your sequence?
Last time I worked with Long-GOP and had to send a file to Pro Tools for Post Audio, I would perform a video mixdown, and take the lone MXF media file generated from this and the Audio team could natively take it into Pro Tools.
However if you need to do final color outside of Avid, you’ll have less luck.
If you are working natively in XDCAM, I suggest you transcode your sequence (using the Consolidate/Transcode tool) and select DNX115/145 as your destination resolution.
Alternatively you could always export a ProRes422 quicktime or a DNX145 quicktime of your sequence and cut it up in your final color platform, if you absolutely do not need handles! Most final color platforms feature auto-detect edit features which will get you 90% of the way there.
good luck!