Is this what you had in mind?
Another option could be to persuade the Leadhills and Wanlockhead Railway to build an extension with a rack section up to the base of the main lifts (and beyond?), sort of like what was proposed for Ben Wyvis (but in Narrow Gauge). Yes, I know it's a train and they have a bad reputation here, but this one would be more like Snowdon which seems to be successful.
Edited 3 times. Last edit at 20.12hrs Tue 27 Feb 18 by tim1mw.