Hallo Saltor and welcome to the thread! Gosh your circumstances sound difficult. How long have you been wanting another baby? Very sorry to hear about your mc.
Your DH saying another baby wouldn't be the end of the world is a good sign, it suggests he could be persuaded. Have you sat down and had a proper structured uninterrupted discussion about it? Does he know you feel as though your heart is breaking and that it is making you feel ill? If not, then I would observe that this seems to be the key to making some progress from where you describe you are now, but it is always so difficult getting the OH to the table and talking.
I don't know about you but I found that I was raising the subject almost constantly, so much so that it was really irritating for DH, but as soon as he actually sat down with me and gave the subject the attention it deserved, I completely calmed down. I also found that with my DH it helped to confess to him all my own fears about ttc and having children, so that he didn't feel that by having a conversation about it he would be buying a one way ticket to fatherhood departing immediately.
As people have said, spend a lot of time getting your reasoning straight in your head, and think about the possible objections he may raise and how you would counter them. Perhaps try them out on us first. We are all super good at it lol (although we are all still waiting so maybe not ha ha). That way you are prepared for the meeting.
As I said, if he thinks it wouldn't be the end of the world then there is a good chance that he will come round eventually. My DH started from the position that if I ever got pregnant he would kill himself . DH is very melodramatic. He's recently been buying the baby presents.