What's your backup plan if LH first availability doesn't release? You're absolutely doing the right thing, checking patterns etc. but it's your honeymoon - you don't want to be trying to check for availability two weeks out and find it isn't their because someone paid cash for the tickets. I'm not saying don't do it, but in the event that availability doesn't release, do you have cash to pay for J tickets or are you willing to take Y space?

Other than that, congratulations on a well researched plan.