Create a way to set a new associated process or task for a form. There is no option available neither on process designer neither on form modeler.

A suggestion is to add a third option to the error pop-up (attached), that allows selecting a new process/task.

How to reproduce the requirement:
If the form is automatically generated for a process, and then, the user decides to change the process id, the form is now useless since it cannot be associated to any process (that now have different id) using only business central (no text editors).