Sounds good, hope it works.
Might be an idea to try, if it doesn't work out, to get some older guineas from a place where they have stayed for several generations and not roamed far. Introducing them into the flock can strongly shape the younger guineas' behaviors. Alternatively you could breed that trait into the flock using birds of any age.
With all of my animals I've noted the trait to wander is partly based in genetics and partly in environment/social circumstances and partly in learned behavior, and you can control most of those factors. If space, nutrition and housing is not the issue, then maybe the land is lacking; if that's not the issue, then it'd be social, probably, possibly also a familial trait to wander. Even in most migratory wild species you do get those family groups who don't go anywhere, or don't go far. Their ability to migrate is usually a learned behavior, too.
I use older hens and roosters to influence the social behaviors and patterns of younger or new or subordinate birds, as long as they're dominant and respected they have far-reaching influences on everything the younger or subordinate birds do, from what time they go to perch to where they range to how far they roam.
My entire flock stayed almost house-yard-bound for the first few years, only foraging in the fringes of the forest and the house paddock, until older hens and roosters began leading the younger adults to further afield; they were followed no matter what point of the compass they aimed towards, but always it was the same birds leading the exploration. These were not family groups either, they included unrelated adults who were raised on other places separate from one another.
Kind of a bit like sheep I guess, I don't know if you know but there is a breed of sheep bred specifically to lead other breeds. They're smarter with better homing instinct, and have the reputation of bringing home flocks of other breeds through blizzards and other hazards safely, under circumstances in which normally the whole flock would either perish or lose a significant percentage.
I've always seen that some chooks, geese, etc lead others, there's always a follower faction (being the majority). My leader chooks have been a few roosters and a few hens, all of them Silkie mixes (they seem far more instinctive and the other chooks of all breeds seem to think they're the best, lol, which I know isn't representative of most American Silkies so probably sounds weird) --- and it hasn't had anything to do with physical ability, just mental ability and instinct levels. Even age has nothing to do with it. They lead older chooks around. Even with chicks you can often see the followers and leaders already decided.
I once had a ewe who was a leader-breed sheep, she attracted followers like a magnet attracting metal shavings. They'd break out of neighbors' paddocks to follow her like she was irresistibly attractive. I've seen the same thing happen regularly with dumber breeds like Isabrowns and smarter breeds like bantam mixes.
Anyway, best wishes with your guineas.
