Your selfless Scribe has been making enquiries, and has the bare bones of A PLAN !
Friday 20th at Portnalong, but in the bothies this time rather than the wigwams.
Saturday, I'm thinking that rather than mooch and return to Portnalong and then confront a 400+ miles hangover trip home on Sunday, howzabout go to a second stopover on Arran?
That way, it's well under 300 miles back on Sunday. If it's nice, we can detour, wet, direct route with plenty stops and no rush.