IVF for single women

Shalom,
Before I ask my question I just want to inform you that at the moment I am not asking for a definitive psak halacha, I am just doing some preliminary research – I will not be implementing any of this without significant further research and deliberation.
I am a 40 year old single woman from an Orthodox Jewish background. My question is regarding IVF for single women. I've heard that some women have done it within the framework of Halacha. From what I understand they were required to use sperm from a non–
Jewish donor because of a) fear of siblings marrying at a later date b) prohibition of zera levatalah for a Jew. However unlike IVF for married woman there would be no problem of mamzeirus (when using Jewish sperm donor) as a single woman is not an eishes ish. So I am wondering if there is a way to circumvent the other issues with a Jewish sperm donor. Perhaps one could use "left over" sperm cells from a married Jew who has provided it for IVF with his wife. And one could be aware of his identity to prevent any problematic marriage later on.
I know I'm missing lots of information, But I'm wondering about this and (aside for the issues of raising a child without a father plus other possible halachic issues) the idea of using a random non-Jewish sperm donor just stops me in my tracks. With so many single women and so few men, I think many more women are thinking about or will be thinking about the option of having a child on their own, so this may be a new halachic frontier. And perhaps there's a way to do it with a Jewish sperm donor.
Thanks for your help,
R