My situation is a bit different, but I will tell you what we did last week.
I had two gold renewals, for me and dd. They were set to expire in January, they had not yet been used/activated. I had called and asked, if I could pay the difference between a renewal and a new pass and start my pass as a brand new Sorcerer pass. They said yes, but it needed to be done in person. I was not real confident in that.
We went to HS guest services upon arrival, and I asked the same things. She said something about expiration on 10/24, I pointed out she was looking at our Boo Bash tickets.
She said she could do it, and started working on both our passes. I asked her to activate dd's first, because I didn't want to pay the difference for hers. She did hers, then mine, and told me they would be both expire one year from the day we enter the gate. She didn't charge me anything, but she was already done. I didn't believe what she told me, but after we went into the park, our expiration dates for our Sorcerers passes, with the free photopass, was indeed 10/16/22. I have checked a couple of times since, to make sure it didn't change LOL, and it didn't. I was beyond thrilled, and I still can't believe she did it. I was gladly willing to pay the difference. I believe we got a major dose of pixie dust, so I wouldn't count on it working that way for you, especially since your date has come and gone, but this is what happened to us.