Batfink,
I don't think we're talking about the same route.
The one I had in mind starts at the SECC and goes through Partick, Scotstoun, Clydebank, Bowling, Dumbarton and so on to get to Loch Lomond. You do follow the Forth & Clyde canal towpath from the shopping centre in Clydebank out to the Bowling basin.
I think it's the same canal you're thinking of, but going the other way. Starting at Maryhill you could run out towards Falkirk along the towpath but I don't know that at all. I do know that Scotrail have adverts at Falkirk & Linlithgow stations pointing out the towpath routes. Maybe take the Edinburgh train from Queen St to one of these and run back?
See you in Edingburgh in June!
Tommy.