Get well soonest! On the optimistic side .. Sept weather is often good.
I see you have Macroom on the route. Avoid the town at all costs - esp. on a Friday, esp. with construction of new by-pass ongoing. It's jammers and impossible to filter.
I suppose you were planning Millstreet - Macroom - then via N22, R584 to Toonbridge , Inchageela
Well, here's a good alternative that still includes the lovely Pass of Keimaneigh and Gougane Barra. map link
Be sure to have a pit-stop at Gougane Barra, it's a gem. Cafe available. Only 5km detour in total.
Good luck.