Metadata sorting of grouped asset listings

Hi


I am doing a grouped asseting listing using a metadata field I want to sort by the raw metadata value but display the presentation value.



I have a metadata field (type select) set up with values as follows



Option Key: Nationwide Vacancies, Option Value 01 Nationwide Vacancies

Option Key: Auckland Vacancies, Option Value: 02 Auckland Vacancies

(… and so on)





I would like to display



Nationwide Vacancies

vacancy 1



Auckland Vacancies

vacancy 2



but when I change the Default Metadata Sort Type to raw value the asset listing displays the raw value.



any ideas