Is it permissible to deposit money in an interest-based bank on condition of not benefiting from the interest and paying it to settle outstanding commercial debts via bank checks, as the sole solution for settling debts in commercial transactions?

It is impermissible to open a current account in a usurious bank except in cases of necessity or dire need. It is also impermissible to open a savings account if a current account can be opened. If that is not possible, then there is no harm in opening a savings account. The interest earned should be taken and spent on general Muslim welfare, such as hospitals and schools. It is not permissible to benefit from it personally.