Do you have a Hydraulic TO Bearing release system? Where there is no arm, and the TO Bearing moves hydraulically? That seems to be what you described.
It seems like you've covered your bases.
I'd say, try the deal w/the wheels in the air first, then drive it around w/your foot on the clutch (As previously mentioned). BTW, start it up, in Neutral, and get the oil circulating before you start it w/wheels on the ground. It might break it loose. I don't see how it could hurt anything and it might save your 2-3 hours worth of work (each way). Try it foot on the clutch, accelerate and engine brake.
On my ATV, it was parked w/the brake on (The reason that I mention this is that brake and clutch linings are similar and both of em fused to the rotor and flywheel because of moisture). We couldn't tow it to break it lose. I don't remember what I did. I sorta think that it released on its own, after the WD40 or Penetration oil was applied and the brake was released, and I just let it sit. I'm not advocating WD40 on your clutch....pads are way easier to change