Take out the liner and wear them around the house like slippers, that'll help accelerate the pack out rate.
That's going on the assumption that the boot is actually the right size and fit for you. I gotta say that "agonizing foot pain" doesn't sound like just a snug liner, that sounds like a bad (for your feet at least) boot.
If it really is agonizing, sell them while they're worth something (ie not overly customized) and buy another boot
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