I have no idea how GPX output came up, presume like everyone else you just want to have the track more visible on the screen while riding the bike?
The only related .gpf tags I can find across my different devices (78sc, Rino650 & 66i) don't relate to width:
<TrackLog>1</TrackLog>
<TrackLogZoom>1</TrackLogZoom>
<TrackRecordMethod>2</TrackRecordMethod>
<AdvTrkTripRecording>0</AdvTrkTripRecording>
<AdvTrkRecordedDataReset>0</AdvTrkRecordedDataReset>
<TrackColor>14</TrackColor>
and there is also a :
<MotorcycleSettings>2</MotorcycleSettings>
Presume yours are similar and you've already seen them.
A couple of long shots, seeing it's a common issue on bikes you could try 0,1,3,...in the MotorcycleSettings and see what happens?
Or if you want to be a crash test dummy is there a specific Garmin text reference in the .ktmf that might give a clue to a yet unknown tag for experiment in the .gpf? I just tried adding a <TrackWidth>2</TrackWidth> to a 78sc .gpf to see what would happen and as expected it didn't work, but on the plus side it simply removed the offending entry from the file and caused no other issues. I have no idea how your device might react though.
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