The West Kernow Way? It can easily be shortened
I have a set of gpx files i planned for a tour heading East from Exeter along the coast to Bournemouth and beyond . I haven’t yet ridden it. But you might find a section that works for you. It was planned in strava so i could see the heat map and with os maps on another screen. Let me know if you want me to find a way of sharing it.
I also have a route that i road on the isle of white over 2 half days and a full. We had 2 day’s in the same place. I have ridden that one and it could be extended