jmmemoL¤Just remembered -> https://memo.cash/profile/1DkKSF2yJVkVj1BhoKFnxHQcSm9t1tJQjm <- which solves points 2 . and 3. so I am back to the problem of address discovery.
https://whatsonchain.com/tx/b2c8015f0e22756712a600be661967ee57638da481d74ce9581051eb9784d63f