You might have to end the relationship, cause this is a huge issue to disagree on. Even if you do manage to convince her, you probably dont want your kids being taken care of by somebody who didnt want them in the first place, but only had them as a means to appease you. That resentment may fester.
Personally, I am extremely GMB, but will still have kids. Im freezing sperm towards the end of this year and will have the kids around a decade from now.
Health issues from Kids born in your 40s arent really a concern if the sperm is frozen at your most fertile years. Unless a literal angel descends from the sky and falls onto my mattress, I will most likely go the surrogate route. I will NOT play the lottery. Ronaldo gave us the playbook brehs.
I also agree that kids are expensive, which is why im putting them off a loooong azz time. In part for the children's stability, but also cause i need time for a PHD and few years of research. I'll have the time and money to raise those kids later.