I'm a lesbian whose breastfeeding counsellor offered to help my dp breastfeed as well. Our response was, "Ooh no, seems a bit odd and fetishistic, we'll just keep it nature's way, thanks".
I'm also an adoptive mother, who once watched a TV documentary about an American who adopted from China, who went to huge lengths to 'breastfeed' this toddler from the first day she met her, wearing some device involving bottles and tubes. I thought, "Hell no, that is a toddler who has no experience of breastfeeding, why are you forcing this experience on her when you are still a stranger to her?"
I breastfed my first child for nearly two years, and occasionally did get comments about extended bf being for the parents' benefit, not the child's. I was
about that, but in the two examples I've given above it was really true, and it's no less true for the trans parent. Shocking that the doctors actively colluded with this fetishisation of biological motherhood.