Not quite what you are looking for: https://blog.asrpo.com/collaborative_trades https://blog.asrpo.com/collaborative_trades but I've heard at least one person

Not quite what you are looking for: https://blog.asrpo.com/collaborative_trades https://blog.asrpo.com/collaborative_trades but I've heard at least one person wanting to go in your direction (of getting a group and discuss) instead of what I wrote.