You are wrong in stating that only a lactating woman can breastfeed. First of all, Male breasts are just undeveloped female breasts... a few hormones, and they can develop and start lactating. It does occur naturally, and I am sure it can be stimulated with hormone injections.
Next, my wife had lactation issues with our first child. Our daughter would feed for maybe 15 minutes, and then due to slow supply, she would give up. Mamma would then switch to a breast pump, and I would take the previous 'harvest' and with a finger tube, our daughter would feed from my fingers. I had not been pregnant, so my breasts did not have the hormones to instigate lactation.
So, our daughter got the benefit of breast milk, she bonded with Mamma on her breast, and she bonded with me, Mom, on a finger.