Remove the rear sling swivel. Don't sweat the broken tab. I think we've all done it at least once, and as you've discovered, the sling swivel holds the pad in place quite firmly!
Shortening is possible, though reusing the factory buttpad will be more difficult. A better solution might be to, once the stock has been trimmed sufficiently, attach a block of wood in the stock cavity and attach a regular, aftermarket buttpad.
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