I organise an mtb event, always refused to use Komoot, Strava or other apps just to display an XML file on a map.

I have used brouter.de as a GPX editor instead of going on site to the route, and used Umap on OSM.ch to upload a GPX:

https://brouter.de/brouter-web/ http://www.vintagemtb.org/maps https://umap.osm.ch/