Higher Road (round the back of Kirton) upto Barnstaple Cross is quiet & avoids the A377. Then Colebrook...
I have ridden that way several times in the past couple of years.
Spreyton to Whiddon Down, good tarmac & scenic.
I haven't been that way though. I went... Binneford, Drewsteignton, Drogo Castle, Chagford. I came across a few too many ultra-steep, ultra-narrow lanes that way!
I have ridden two ways from Mortonhampstead. This is me cycling up from the end of NCN 28 to Pepperdon Down...
The second time I went along the opposite hilltop before dropping back down to the railway path to Bovey Tracey. I wasn't sure about that top road. I thought I would try via Sanduck and Lustleigh next time. Aaargh - I have just noticed that my OS maps are out of date - much more of that disused line has now been brought into use! I can use the
path to get down to Lustleigh... D'oh!
Long Covid means I can't do a long ride...
I'm sorry to hear that. I hope that you recover ASAP. I know from my (non-Covid) experience of illness what that feels like. In fact, I am probably still limited to only about 75% of my natural potential, but at least that is enough to tackle fairly tough routes as long as I don't push too hard.
... but might be able to meet you at one of the hostelries along the estuary on your way back.
That would be good, but I have arranged meet-ups like that in the past and something has always gone wrong, causing delays en route! You would be taking the chance of a longish wait. Hopefully, that wouldn't happen, but best to bear it in mind.