It's not so much a "bridging" question as an upgrade. Yes, regular 10-day PH tickets can be upgraded to Sorcerer AP. Other than whatever commission she may receive, the only savings is if you purchase discounted tickets through a third-party authorized reseller (which probably eliminates the commission -- so do the math). The credit towards upgrade will be the price that WDW sold that same ticket on the date you purchased yours. You can upgrade prior to using the tickets or at any point before park close on the date you use the last entitlement (or expiration). Your AP will be back-dated to the first date you used the multi-day ticket and expire in Oct. 2026. It will not be a new voucher that starts on your next trip. Do the math and decide if it's better to have an AP that isn't used for 7 months vs buying 2 sets of multi-day tickets. It may be worth it since you are eligible for the DVC Sorcerer AP but be sure to take into account the discount or commission she won't get on a second set of multi-day tickets.