From someone who holds a ton of Cas:
If it is this urgent, peel the damn thing. There are plenty of wallets that will allow you to do so. No offense, but the world won't be missing a 2013 brass Cas; sell the peeled coin here if it will make you feel a little better. Don't compromise your financial/life situation to preserve a piece of history, which in the case of this coin -- is abundant.
I'm considering doing just that with my 2012 Cas. Thoughts on that?
Wouldn’t fault you for it if you need the USD. But, if you were to peel it and let the BTC sit in a crypto wallet I’d be confused. If you peel, do it carefully and keep the hologram attached so you can auction the peeled coin here some time.