I haven't been to Grandview, but camping @ Barcroft is doable, if not spartan. There are pit toilets but no water.
I camped at the Grove of the Patriarch cut-off last year during a mid-may summit of WMP. It was breezy and cold but the hills up there are gentle and it wasn't difficult to find a nice flat spot to car-camp. If I remember correctly Barcroft had a number of nice spots to drop a tarp and pitch a tent.
With a warm-up on Dana I'd think the 11-12K would allow you a decent night's sleep.
