Yes, absolutely, most brokerage accounts let you request ATM card/debit card/checks to access your core position. Additionally, Both Fidelity and Schwab let you open a free checking account(1) as well with no balance limits and ATM reimbursement.

Second bank account is more important than second credit card, IMO. Being locked out of your cash is much worse than being locked out of your credit.

(1) technically they are brokerage accounts also, at least for Fidelity, but they hold your deposits in FDIC insured banks and are designed to be used for everyday spending, exactly the same as a checking account.

>Being locked out of your cash is much worse than being locked out of your credit.

As a general principle I tend to agree. But, when traveling, having something that functions as a credit card can be pretty important. (Of course, if you have a healthy cash balance and a debit card, that works equally well.)