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Full disclaimer, I simply drafted it after you asked, never rode it, review the route as much as you can and have a few backup plans (can always follow the NCR 1, thne 50, then 11 to Cambridge).
As you've learned RWGPS is your friend.
But still let me know ;)PS. If it's post lockdown and you're looking for company, I'd be keen to ride it as well and come back on a train, when all of that will be normal again
Looks like you could piece together a bunch of walking trails:
Meridian Trail (untill Epping)
Forest Way (untill Bishop's Stortford)
Harcamlow Way (until The Dell)
then you jump to the Icknield Way until you hit the Roman Road past Linton.
I drafted something below. I'd expect no less than half a dozen of gates, some barking dogs (and owners) ad a few bits to be re-routed depending on conditions. I'd definitely give it a go! (or please report if you do)
https://ridewithgps.com/routes/32536144