I am aware of a couple like the OP. One frozen sperm and donated to someone they knew. There is a boy as the result. They have some kind of shared arrangement over parenting or access though I don't know the detail.
I have concerns over even this arrangement if I'm honest. It's framed as the child having more people who love them. But from conception they haven't been centred really. We know how hard it is for children to have multiple homes and no single home - it affects how secure they are. And parenting between households and maintaining parental consistency is hard. We know the difficulties of step parenting arrangements. Also seeing a child as a timeshare kid from conception bothers me. If circumstances end up that way and it can't be avoided then it's sad but necessary but doing it in a deliberate and planned way I find hard to support. The potential for custody battles to spring out of it is really high. I don't doubt that the child is loved, but I do think there is way too much unrealistic 'we are all going to live happily ever after' going on too that pretty unfair on the child.
I think others perhaps won't feel as strongly as me on this, and think it's essentially homophobic / extremely conservative. However I think it's about responsibility and putting a child first and making a deliberate decision to bring a child into that scenario isn't about their emotional well being and security first. It's about the desires of the parents with the child's reality as a second thought. I do understand that not everyone has an ideal family set up and things do go tits up despite best efforts in a 'normal' relationship but it's about the planning and intent of that which doesn't sit well with me
It's hard enough to do with someone you are in a relationship with and live with. Planning to do it with a third party who you then tie yourself to and perhaps their partner and your own partner in the mix and there being multiple homes etc etc adds a layer of complication that is huge.
But as I say, I get that others will feel differently to me on this one and think I'm old fashioned.
I think in terms of donation, I think it's better to have an arrangement of clear primary carers without parental rights being present but having an awareness of who your biological parent is, is important too.
Having a trans parent brings its own complications too that I think people should be honest with in terms of developing boundaries over biological sex and understanding reproduction. Stuff like the bathroom of choice, may seem trivial but if you are teaching a very young child, how much are they going to understand? This is important to their safety and well being. We know that gender ideology is leading to children having this belief they can change sex and still have children and live happy ever after - neglecting the reality of surgery and perhaps safety (personal boundaries) in the process. Saying stuff like 'people like me have to use the ladies to be safe' opens up a can of worms in terms of ability to identify risk and teaches that women are secondary and need to budge up.
I think I'd be interested to know on how you approach stuff like this. Who makes the decisions. How much planning over how you feed the child, bedtime routines, primary caring, choice of schools, conflict resolution in what may be an informal / non legally binding situation, rights of partners (who is on birth certificate and has parental rights and thoughts about what happens if relationships breakdown). The added layers of complications to put on an infant or young child boggles my mind and I simply don't believe that most would think of a lot of these issues ahead of going through with it.
It's something I've thought a lot over and think about through the lens of having had DS and his need for stability.
Im not wishing to upset anyone, with this post, but I do think there's a bag of potential issues that should be open to discussion and thought, because it's important for any children in this situation. They might be more loved but we can't afford how it affects them on a practical level and legal level either.