I have heard that there are things you should not combine with shatavari or goat's rue, but I don't know if that is accurate. There is a Facebook page called "The Leaky Boob" where I have seen several moms post about that.
I fully understand your sentiments about having another baby to nurse! I have a new grandson and I would love to be able to nurse him when he cries, like I did with his dad. It has been 14 years since my youngest child weaned and I still miss it, too. Before I had any children, I thought nursing for more than six months or so was a very long time but, when Joanna weaned at 20 months, I thought, "NO, not all ready!". She was my earliest "self-weaner".