Kismet - I think that sounds like a really good plan. Your LP may just get to the right length without making any changes if you're willing to wait. I've heard good things about b6 for lengthening LP, and I started taking it about a month ago. Of course I won't know if it makes a difference; even if my LP ends up being a good length I won't know if it wouldn't have been that way on its own....but I've heard from other women that said after a month of taking b6 their LP lengthened by a day or two the next cycle.
I started tweaking our nursing in July when DS was 11 months old. I didn't mean to. We were visiting my parents and one day I realized that he had gone 6 hours without BF'ing (he had always been nursing every 3 hours or so, maybe going 4 hours). I started seeing if he could go for 5 hours without nursing, twice a day. It turned out to be no problem. In October when he was 14 months old my parents came to visit and again, we were out of our normal routine, busy, and having fun, and he went a whole day (12 hours)! I got my mom on board and for a week I tried to distract him enough so he wouldn't nurse for the day. He didn't increase night nursing either. We were still co-sleeping every night, and he nurses on and off throughout the night.
I wasn't super rigid with it, if he really wanted to nurse, or if he got sick, I didn't restrict nursing. I guess technically it was led by me, by I followed his cues closely. If he seemed upset at not being able to nurse, I let him. Usually he was easily distracted, at least during the day. Night time was another story!
At the beginning of December I started craving more sleep. My husband took him one night in another room, with the goal of having him for 6 hours. I didn't sleep very well because it seemed strange to not have my little guy next to me. But I was willing to try again, so we did. One time he ended up staying with DH the whole night! Gradually we came up with a schedule where DH would take him every other night, and we all ended up sleeping very well. DS has had better nights with DH than with me - one night he slept for 8 hours straight! He never does that with me; he wakes up and wants to nurse.
I also tried to see how long he could go without nursing straight. I had read from La Leche League that trying a 24 hour break from nursing could be enough to bring fertility back. Again, it happened sort of organically. One morning after my husband had him, my son didn't nurse. He went straight to playing and didn't ask to nurse when he saw me. He ended up going about 18 hours without nursing I think, and I did that a few more times. The most we ever made it was 23 hours, at the beginning of January.
I've read that gradual changes are less likely to bring back fertility, but I didn't want to make a sudden change. I think DS and I were happiest doing everything gradually. It hasn't felt like weaning, and I take comfort knowing that the changes I made weren't just for getting pregnant again. It felt like such freedom at first to be able to go through a whole day without nursing if we wanted to be out and about. And when we did sit down to nurse, it felt like a special treat. And then having a night every other night all to myself has been so indulgent. I learned how to sleep for more than 2 hours at a time, and being able to come out of sleep to wakefulness all on my own is heavenly. It just felt right to make all those changes.
I'm sorry this has been so long; I didn't mean to write a book! I hope someone gains something from my experience though. I felt pretty lost through the process at times, and looking back I think I made my way pretty well. So I hope I can help someone else.