It's your device and you should be able to do what you want. I do want to point out though that in your specific case, your use of such tools, whether Shizuku or Dhizuku does actually affect the security of your device and could easily be exploitable. And yes, even lending the DeviceOwner permission to another app temporarily is not great...

However, it's problematic if the banking apps also block regular configurations on something like GrapheneOS, e.g. by inspecting the initial call stack of an app. There are many such trivial to bypass ways of doing root detection and most are easily circumvented anyway.