I think many of us have vague notions and half baked
theories on primitive woods surviving with migration as an
option. I for one, do not think it has a substantial probability
of success. There is a huge amount to know for very little
return on investment. Example: study plants books and actual
plants and get really good at identification and prediction
of locations; a lot of work and the knowledge will fade,
if unused.

Some of the primitive woods forums will deal with
this much better. I think Elpel did a walk across Montana and
there are plant experts who have written books and post on some
of these forums.
Do some Googling and you will find a lot of the important
info is already posted.

Another problem, if you publicize a decent strategy, and provide
details, the animals and plants along that route may disappear.
Nature is very fragile when attacked by a bunch of recreational
scavengers.

A thread with a well chosen context and constraints for the
discussion will get much better results than one that is too
general.