So, just as a thought experiment - just for you, Haakon - because that is too cheesy to be used:Does he have a sidekick at some point, who tragically dies when they are forced to escape?
So, in the in the winter after Barahir's men are killed Beren has yet to learn how to survive a winter alone, he meets small herd of wild horses in the woods not far form the graves of his lost comrades - he himself does not go to the graves themselves as they might be watched and he wanted to leave no traces in the snow, so he stay above in on a stony hill, he is terrible hungry, cold and dejected. The herd sees him freezing, standing there alone and they move around him to warm him with their breaths, and there is a mother and and almost yearling foal that is still suckling and that stands aside and nudges him to have some of his milk so that Beren - in wonder - gets some warm milk into his cupped hand and has something warm and nourishing to drink. Been is moved, he is the only one left to defend Dorthonion and the land itself seems aware of it and it itself feeds him. He takes this as a sign to continue on and himself to be bound to be Dorthonion's guardian. He stops hunting its animals, as he consider them now fellow Dorthonians under his protection. The foal he then sees from time to time growing up over the few years and it does treat him as his "milk-brother" and always greets him, but he consider it to young for riding. One day after those 4-5 years Beren is enjoying the wind and sun in the heaths in South Dorthonion when a pack of wolves/wargs happen upon him, then the horse comes running seemingly out of nowhere and Beren mounts it without thinking. It bring him to the cliffs of Ered Gorgoroth and throws him down, and he falls a substantial but not live-threatening distance down a cliff. The horse, still above on the heaths, then turn and runs away, the wolves following it. Its fate remains uncertain, but Beren finds it impossible to climb back up and is forced to try the way down the terrible mountains - in spite of all the horrid tales he heard about them as a child. As he has come to regard the horse as a "ambassador of Dorthonion" to him, he regards himself now as having been released from his duty towards it.
Here you have it, included a reference to movie Aragorn and Brego. - Cheesy enough for your liking?