How to ask my husband to carry our baby

I've been with my husband for 5 years. He is transgender. We met through friends and I had no idea he was trans. He told me on our first date. We've been through so much together and I love him. My dads side of the family knows because they're the more liberal side. Moms side. They don't know shit. They are extremely racist, homophobic and transphobic. Me and my husband have been trying for a baby. We are using am anonymous sperm donor. We have been trying for a year and a half. At first home inseminations, then at a fertility clinic... Every pregnancy ended in a miscarriage... I've had 7 miscarriages... So... I found out my body can't sustain a pregnancy... It destroyed me... My husband comforted me and said we would have a family one way or another.... Well... I was thinking... Maybe he could carry the baby! My husband got pregnant once back when he was a teen. He sadly got into a car accident and lost his son at 27 weeks pregnant... But we know he can sustain a pregnancy! This however would be a LOT to ask him. He would have to stop his hormones... Everyone would know.....I was at the very least thinking of attempting to ask. How could I ask him in the most sensitive way possible?