Could you use the Strava option to trim the course? It’s messy but do it once removing from the end of the ride to the start of the segment you want removing. Export from Strava then delete from Strava and reimport whole ride from head unit. Then trim again but from the start till the end of the section you want removing.
You can then either reimport the first section and have two workouts or look for ways to combine two gpx files. I’m not sure how the latter would act when finding a missing section between the two files though.
Other than above I’m no other ideas, sorry.
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