Scald converts SAS in a text field after input filters, not before as stated

Scald's documentation (https://drupal.org/node/1801156) says that if a text field contains SAS, the SAS is rendered back to markup first, and "After that, the field value is sent to the Drupal filter system."

However Drupal's input filters are processing the text field before Scald receives it. This can cause a problem where the filtered SAS cannot be recognised and converted to html by scald (see issue https://drupal.org/node/2211781)

I cannot find any documentation explaining the interaction between drupal's field attach API and formatters, but using debug statements I see that when a node with a text field is displayed, the order of execution is:
- text_field_load()
- hook_field_display_alter() - called several times
- text_field_formatter_view()
- hook_field_attach_view_alter() - Scald uses mee_field_attach_view_alter() to render SAS ->HTML

text_field_formatter_view() calls _text_sanitize(), which runs the filters on the text.

Can Scald be changed use a different hook to render the SAS before the filters change it?

I'm struggling to understand what hook should be used when for what, but I see that hook_field_display_alter() fires earlier, and looking at its arguments the text is still the raw value, before any filters have processed it.

Alternatively could the SAS -> HTML conversion be handled by an input filter, so we can use the admin UI to set it to run before the other input filters?