The only thing you’ll need to watch in your planning is that some of the Cairngorm passes (lairig Ghru - definitely and Lairaig an loigh - depending on how you access it) may need a FWA and all the summits will. The routes round the edge of the plateau are brilliant and well trodden by Challengers and don’t need FWAs.

Thanks all for your kind and very informative responses! And yes, I'll be sure to include any FWAs where necessary!