Didn’t read the bit about high blantyre but yes heading out towards the windfarm is a good call. There’s a lovely wee road at the back of the windfarm that eventually takes you to Galston if you really want to go that far. Or head through Eaglesham, over the moor and onto the a77 cycle path, down to the next junction, left towards galston, you then meet the same road that runs round the back of the windfarm – you’ll be looking at roughly 50 miles for either of those routes though.
Or eaglesham, over the moor, next right down a wee road after the long descent, right onto the a77, next right heading for clarkston then back to high blantyre from clarkston.