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RWGPS has line drawing mode as well.
Once you understand which area is a blocker (most of the time it's a single point - if not - you might be going against traffic), you set points around it, set routing mode to "draw lines" and then just drag the route between points - should be a straight line.
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Basically the advice is if the maps don't work, use the line drawing. In the end I did it in Strava, imported, added some extra control points and I'll tweak the rest later