A notable mention is https://ubports.com/en/ which is different from postmarketos in a sense that ubports uses old kernels with heavy patches. That means: good support for things, but difficult future.
PostmarketOS uses the newest kernels and tries to integrate their patches into mainline kernel, so that the reliability is maintained with all kernel developers.
The new bank will happily organise anything for you, and if not, it is not the right bank, because they clearly don’t want you as customer, like this.
Customer support generally gets worse as you are longer at the same bank because you are more and more less likely to switch your bank staying at a bank. They invest in the customers they see risks of loosing or see a change of winning the most.