That sounds like a good plan at Naran&Portnoo Slag. I just booked some post Buda lodging for Sept 9-10 at Dunfanghy Jazz fest and after leaving Ocean Sands on the morn of 7th, will be making that coast drive past Portnoo anyway.
If anyone is hanging around up north, I'm still planning on making the northern route, and will apply to get on Portrush (I haven't made the inquiry yet). But, I don't feel locked into that, and will probably mix some sightseeing with some other rounds like Slag suggests at Portnoo as I make my way around the north shores and back to Dublin -leaving there 18th.
So if anyone so inclined sees another day in that time span who would like to try for a meet-up round, I'd love to give it a go.