I feel that I have a right to be included in my child's first spiritual milestone and am prepared to eliminate the baby blessing entirely if I'm excluded.

Do a parents blessing at home where the two of you and close family do your own special prayer to the spaghetti monster. Then let him have the church blessing after so it isn't the first spiritual milestone. The church/priesthood is all BS so what does it matter if he gets his moment in the sun, it's a blessing in church that the kid will never remember, who cares.

Side-note denying your husband something he feels so strongly about is super selfish. Compromise. Also, having your wife deny a blessing to your baby because she can't be involve is about as humiliating as it gets for an uber TBM priesthood holder. You want to be involved but you don't want to publicly castrate your husband either.

Good luck. My kids will all receive a father's blessing because I think it is cool in and of itself. Medieval, tribal, patriarchal, and really special for me. The baby blessing is more for the father than anything, fathers have been blessing and praying over their children since the dawn of time without TSCC/priesthood. As a man it is a big deal to me to be able to do that for my children and I bet on a masculine level he feels the same.