Try The No-Cry Sleep Solution by Elizabeth Pantley. Very kind. She gives strategies for moving to their own bed (in stages) and night weaning. All very gentle, and totally NOT CIO. I would, however, say try one at a time. Dont' try them at once, that would be too much for him!
My children night weaned themselves, so it IS possible. My son did at 19 months, my daughter at 15. They will not always associate nursing with sleep. Just wanted you to know in case you felt like this would never stop. But if you're ready, then I definitely suggest Elizabeth's book.
Good luck, and yay to you for wanting to do this in a gentle and kind way.
***ETA I wanted to add that all children are different, as my daughter actually started STTN and night weaned WHEN i let her start sleeping with me!
Also, I think Tracy Hogg's "whisperer" books are hoggwash (pun intended). She tries too hard to be on the fence about things (like she wants to be in the middle of, say, Ferber and Dr. Sears), which I think she does to be moderate and appeal to more people. She suggests taking into account a child's personality, which I think is great, but I believe she is not at all supportive of extended breastfeeding. IN her Toddler Whisperer book, she actually says that breastfeeding a toddler is because the mom is having a hard time letting go, not because it can be good for the toddler. Knowing that she feels that way makes me question any of her other advice.