The only way I can see for the Divine & Dragon Knight to be libarated from their glass shells is for Maxos himself to return... which is unlikely.
Div 3 could, for instance, start with a new hero sent by Zandalor to search for the lost Dragon Knight --- the old Dragon most probably knows about everything that happened... and since Maxos created the tools to enter the Hall of Echoes, it is probably possible that another powerful mage (like Zandalor) could create new such tools.
