Hi, I just wanted to jump on to give a slightly different viewpoint that might hopefully provide balance and help you feel happier with the idea that they cannot be donated.
I am currently trying to freeze embryos with a sperm donor. (I have not yet decided if I am ready to go ahead with having a child on my own but I decided I'd rather go through the process now and buy time to make a final decision, rather than think for a year or so and be even older when trying).
The ethics of using a sperm donor were something I struggled with. I eventually decided to make all decisions with my future child in mind, not myself. What would they want growing up/when they became an adult if they decided to seek out the sperm donor?
So that (for me) meant I needed to disregard using the European or USA sperm donors (where you get a ton of info about the donor, sometimes you can hear their voice, see baby pics etc. With some US sites, you even get adult pics of what the donor looks like now! But, along with that information comes much larger family limits. (Again, with USA I think some sperm banks have no limits!). I figured that the trade of for me getting all that information about the donor was unfortunately the idea of the child growing up having no idea how many half siblings may be out there, or even if they would speak the same language etc.
It also meant choosing a UK donor who had not consented to use overseas so there was a 10 family limit and any half siblings would all (hopefully) speak English and be more likely to be in the UK. If my child ever wanted to seek them out.
It sounds like you are not allowed to donate because then you would breach the 10 family limit? So there are 9 other families and you that have the sperm donor's sperm. If you donate your embryo then that means there is an 11th family with his sperm being used.
Essentially that is beyond what the sperm donor himself consented to and I think that is something that should be upheld. He made a decision when donating sperm what he was comfortable with and who knows, maybe he wants any child to be able to contact him, communicate with him etc, like I considered?
I also think you should think about what it might be like to be the child born from an embryo you donated, for that child to find out one day that they have a full sibling out there and the complexities that may come from that if they did get in touch with either you or your child?
I think these are all good reasons to think about and try to make peace with the idea that you cannot donate the embryos. If I do end up in your position, I think donating to research would be the way forward for me - anything to help people in my position become parents seems the best use for them x