Buy a [large scale] map of each country you'd like to include, and start plotting...
fwiw. there are huge chunks of the TET which are paved roads, albeit mainly minor ones - conversely the vast majority of the TAT (Trans-America Trail) utilises unpaved roads and trails, although there are still some significant portions on the eastern side of the country which are paved (again, mainly minor roads).
It would be impossible to navigate all the way around the whole world without using pavement occasionally (if only to avoid private land), but if you have the time and inclination, you can probably navigate a pretty convoluted route which avoids a lot of paved roads, particularly once you get out of Europe.
Ironically perhaps, by publishing or promoting a defined route (such as the TET project has throughout Europe), the more those particular unpaved roads and trails get used, the more likely they'll end up either being paved or closed at some point...
So I'd leave now while you can, and let us know how you get on!
Jx
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