Is it permissible to temporarily remain in a job at an interest-based bank, with the intention of moving to its Islamic branch as soon as it is established, knowing that there are family responsibilities and difficult economic circumstances?

It is obligatory to leave work in usurious banks immediately, due to the assistance it provides in usury. It is permissible to remain there out of dire necessity that leaves you with no means to meet your needs and the needs of those you support, while diligently searching for another job. And whoever gives up something for the sake of Allah, Allah will compensate him with something better.