Splice in the gps coords that would trigger it then re upload new adjusted file.
Or spoof it with a tcx for how far up the road you went. That's what I've done for the coast path walking pre GPS recorder. Not perfect.
Ride with GPS, plot the extra bit you rode. Save it. Export as TCX. Open with notepad or other . txt editor.
There's some bits you need to delete and bits to add to make it a tracklog. I'll send a DM when I get home.
Splice in the gps coords that would trigger it then re upload new adjusted file.
Or spoof it with a tcx for how far up the road you went. That's what I've done for the coast path walking pre GPS recorder. Not perfect.