Is it permissible to sell a commercial shop that was established with a usurious loan in order to pay off the remainder of it after feeling remorse and experiencing financial hardship, knowing that the bank will not waive the interest?

You are right to regret the usurious loan, as it is one of the grave major sins. It is obligatory upon you to repent to Allah by regretting your action, abandoning it out of fear of Allah and seeking His pleasure, and having a sincere resolve not to return to it. As long as the bank will not waive the usurious increase upon early repayment, you are not obligated to hasten the repayment, nor are you obligated to sell the shop; because the sin of usury is not related to the money itself but to your accountability.