help - I need to get a brake rotor off my van but the parking brake is locked on it

I'm changing the rear brake pads and rotors on my 2005 Honda Odyssey minivan. No trouble swapping out the left rear disc and pads, but the right rear is giving me trouble. The rotor will not come off the hub.

Relevant info:
- The Honda Odyssey's parking brake treats the rear rotor's interior as a drum brake.
- I removed the disc mounting screws, confirmed that the parking brake was not set, and used two 12mm bolts to pop the rotor free from the hub mount. The rotor will move a little, but will not come free of the hub.
- When checking for obstructions, I found two shorn tension pins that used to hold a tensioning spring that kept the parking brake pads from pressing against the rotor when the parking brake is not activated. Hence, I suspect that the parking brake is clamped on the rotor.
- I cannot turn the wheel now to access the parking brake adjuster wheel.

Any suggestions for how I might get that rotor off without damaging the hub and parking brake assembly any further?

Many thanks in advance. I've been Googling the problem but so far have not found anybody else with this issue. I am unsure how to proceed.