If each person has 2 tickets under their profile (a 7 day and a 2 day), then at the 60 day mark (as you are an onsite guest), you will be able to make 9 days of FP for the length of your stay. No need to move tickets or anything. The FP system doesn't ask you which tickets you want to use for a FP, when you have more than 1 in your account. It just checks for the number of days you are eligible to have FP.
I just did this myself. Have 2 military salute 5 day tickets per profile (it's cheaper than a 10 day). At my 60 day window, I simply made 10 days of FPs.
When you arrive you can upgrade your tickets, and you will be set. However... and this is VERY IMPORTANT. Make sure you go to guest services and have the tickets prioritized correctly before you enter the parks the first day! To make sure you use the right ticket. You can also upgrade your tickets at that time.
I would also double check the right ticket was used.
Alternatively, once you upgrade to the 9 day tickets, you can move the 2 day tickets to a place holder profile, and not worry about
using the wrong tickets. As you will still have 9 days of tickets, your FP should be ok.