Need a form api hook for making changes after form alter

Form alter allows modules to make additions to forms.
Form alter could also change the structure of a form, which may be required by some module in some context, e.g. node type.
However, a module cannot change the structure of a form, really, until all the form components have been added.
Modules are called to alter a form in a sequence that is either defined alphabetically or by the order modules were enabled.
As a result, it is beyond the control of any module to make structural changes to a form in such a way that certain preconditions to the change are available at the time of call.
So, there could be 1) a way to set the order, 2) a second api hook to be invoked immediatly after form alter, 3) there can be a schedule determined for a second api hook to be called.
As a good start, choose (2). If case (3) is ever chosen, it should be under the control of an administrator.

Here is some code which may alter a form structure. It a fieldset out of added fieldsets.

function copious_build_store_final_form_alter($form_id, &$form) {
// This is called before form alter and content form alter.

  if ( $form_id == "catalog_node_form" ) {
    $storemoved = array();
    // Alter the form for correct widget appearance.
    foreach ( $form as $key => $subform ) {
      if ( ( $key != "subtrees" ) && ( $key != "others" ) ) {
        if ( is_array($subform) && ( $key[0] != '#' ) ) {
          if ( isset($subform['#type']) && ($subform['#type'] == 'fieldset') ) {
            $form['others'][$key] = array();
            $storemoved[] = $key;
          }
        }
      }
    }
    foreach ( $storemoved as $key ) {
      $form['others'][$key] = $form[$key];
      unset($form[$key]);
    }
  }
  $key = 'log';
  $form['others'][$key] = $form[$key];
  unset($form[$key]);
}

But, for this to be called, there has to be a small change to form drupal_prepare_form.
Here is code at the bottom of the subroutine:

      *
      *
      *

  foreach (module_implements('form_alter') as $module) {
    $function = $module .'_form_alter';
    $function($form_id, $form);
  }

  foreach (module_implements('final_form_alter') as $module) {
    $function = $module .'_final_form_alter';
    $function($form_id, $form);
  }

  $form = form_builder($form_id, $form);
}