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The etrex series are probably the closest to what you need. Something like the etrex 20 which is not to bad at on device routing as it allows multiple via points which tends to ensure it follows the type of roads you want unlike the edge series which only allow you to choose the end point and routes you according to its inbuilt algorithm.
Garmin etrex (more designed for hiking but useful for anything) will let you follow pre-planned routes and navigate to places ad-hoc but it's not as nice as Edge models for use while cycling.