Well if the riders are a bit retro, then why not ride some newer paths. How about this route?
https://ridewithgps.com/routes/44055720
Starting from WSU-Rydalmere near James Ruse Dr, up the new Parra Light Rail Trail to Carlo, cut cross thru Epping to Mac Uni and North Ryde, then down the newish Pittwater Rd shared path to Gladesville, then find our way to Parra Valley Cycleway and back to Rydalmere. Only 35kms with a bit of gentle climbing. Few train stations around to bail out if needed. Just need some tips for coffee/cake stops along this route?
Any alternatives or happy with that?