Four for one.
I'd loan any non breathing thing I own to a friend. They are just things, easily replaced, friends are not.
A beater is something currently working, no replacement insurance, and if it died tomorrow would not be the end of the world. No additional major investment is planned or warranted.
You seem to already have a great plan. Take your buddy camping, have him do allllll the work, you hold his beer while he learns. I would add one thing. Then unexpectedly charge him for the trip. Then he'll have a more authentic experience.
We are so good at spending other people's money. Lol