Re: Sharing a bed/ night feeding?
Safe co-sleeping rules state that the only person sleeping next to a young baby is the mother. If you want to attempt to sleep with both children you would have to make sure they slept away from each other, like on opposite sides of you, at all times.
I would try to transition my older child out of bed, but that is based on my experience with my current 2yo, who rarely sleeps with us, but when he does he is all over the place and it wouldn't be safe.
BTW, you say sleeping with your BFing kid is lazy, but I think you mixing up "lazy" and "practical".
My little man was born 12/17/2010.
Baby girl was born 4/30/2014.