I will be mobile that weekend back and forth to Glasgow so will check the times and even fit a radio in the car just in case.
I activated Ben Lawers and her four pals several years ago on a Thursday and managed to get more than enough contacts for each summit. Here is the link to the report. Activation of The Lawers Quad
Obviously to manage this route you need to get dropped off and picked up at the end. But you could manage to do the four summits in two trips.
Looking towards Ben Lawers from Meall Greigh summit
Looking back along ridge from Ben Lawers.
Anyhoo, best of luck and hope for your success - and the wx is kind.
73 Neil