You can probably get it out without removing the seat, but you'll need thin arms and a good sense of feel. The seat comes out with 4 bolts. They are star bolts, but a regular 10mm hex socket works just fine.
Yes, that loop under the headlight tray is the emergency release.
You need to get the battery disconnected first. Pulling the immobilizer or seat without disconnecting the battery will only cause other issues.
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