I have some reservations about it. Partly because I know that I'd be a terrible buddy! I would need an app to remind me to check if someone hadn't been around for a while.

And I do drop out of contact without notice.
Also though. Longer term members also have their own stuff going on. It's not at all unusual for them to be away for a while themselves. So the newer members might feel even more lonely. Maybe make guesses about why the other is away. "I was PMing them too much. I was too needy. They don't like me." That are going to be really painful. As well as probably not true.
And finally. We always have many, many more newbies than long term people. You can see in most forums. People ask questions which don't get answered. If they do get an answer. They often don't reply. And very few stick around to give support in their turn. So I think it would be asking a lot of longer term members. To make this kind of commitment. To newer members who may literally never return. Or are here for a short while. But not long enough to support in turn.
As it is. The forums are open 24/7. And many parts have chattier threads like "How are you feeling today." Or there's always lots going on in
just-for-fun/ Keeping support forum centred. Means that no one's disadvantaged by being in the "wrong" timezone. And anyone can support anyone else. There's no seniority. No one's paid to be here. We all just help each other as best we can.