Yes, Glossop & Hadfield is being considered as a possible tram-train opportunity
It was also considered in the original 1984 Metrolink proposals as handover to being a 'pure' Metrolink route. It then got replaced later by the current Ashton route, seemingly due to the expense of proving fully segregated infrastructure (e.g. flyovers), and the Ashton route is better aligned for what is now the area around the City of Manchester stadium velodrome (the focus area for Manchester's bid for the 2000 Olympics around the time the Ashton line was conceived)