Here are two - I have ridden all these roads together and in part eg a 200 back to Exeter, as well as first 14 hours' riding of an end-to-end.
You can export gpx files therefrom, or after editing.
https://ridewithgps.com/routes/57677575
This goes via Hayle and Camborne to Truro, cuts up to and parallels the A30 to Bodmin, takes the Camel Trail north and of the moor, then cuts back to the old A30 to Okehampton, ENE to Crediton and right flanking the Cadleigh Hills to the old A38.
https://ridewithgps.com/routes/57677591
This is more or less my first day and a half: Marazion, Praze, Redruth, Newquay, hilly coastal bit to Padstow, ferry to Rock, Holsworthy, Hatherleigh nice line to north of Bampton, Taunton (and NB thru)