In most states including CA the norm for surrogacy is to use a donor egg, unless some type of shared parenting is planned. The birthing mother has no legal rights to the baby. This prevents the surrogate from changing her mind. The sperm donor is the legal parent to the baby, if there is a partner they would have to adopt the baby to be considered a legal parent.
There is always the possibility of something nobody in their right mind ever thought of (like this monster ASK) that causes changes to be made. This poor woman who gave the ultimate gift by growing this new life for them. I cannot imagine being in her shoes, having to hand over the baby. I think I would go to a state where surrogacy isn’t legal to give birth & get the birth certificate. IDK if that would help or not but no way I would want to hand over this poor baby to either of the fathers.