Assuming, as the reply from Cllr Smart's office suggests, that the plan is connected to another plan to introduce or reinstate a line from Ashton to Stockport, then it won't go anywhere near High Lane or Hazel Grove, that's for sure.
Building a link between the Marple - Piccadilly line and the Stockport -Guide Bridge line at Reddish Vale is a well-worn topic around here - or it was a couple of years ago. I think I may have been a bit of lone voice in advocating it, but I still think it could work, and could provide a reasonably quick rail link between Marple and/ or Rose Hill, Romiley, Bredbury, Brinngton and Stockport, with the added bonus of reintroducing a proper rail service at Reddish South.
A sample timing, derived from the actual times of current trains, works out like this:
Marple/ Rose Hill 08.00
Romiley 08.05
Bredbury 08.08
Brinnington 08.11
Reddish South 08.15
Stockport 08.20
20 minutes from Marple to Stockport (and vice versa) at any time of day. Not bad, IMHO.