how to set change gsl::final_action inside sub-scope

Question

How can I set a different gsl::final_action inside an if statement, since assignment constructor on final_action is deleted? In the example below, I only want to create and delete a resource if condition, but delete_resource should be called at the end of the parent scope, not the if block.

some* resource = nullptr;
auto cleanup = gsl::finally([] {});
if (condition) {
  resource = create_resource();
  cleanup = gsl::finally([&] { delete_resource(resource); });  // ERROR
}