In reply to Belthazubel:
A couple years back, I did the arête on the last day of a 4 day walk, so had a big rucksack. No idea the total pack weight, but the tent was on the cheap (and therefore heavy) side, and I don't own much generally in the way of fancy light gear. So i'd like to imagine it was at least as heavy as what you'd need for just the one night!
I don't remember any issues with the bag during the ridge itself. I would say that it was technically far below what I'm comfortable on (given a background in climbing) and everyone's experience may vary, but given it's a horizontal route and not a vertical one, you are standing up a lot of the time. Just have to be as careful with balance as you would with any size bag, but most of it is extremely secure for hands and feet - just some occasional exposure.
It does help too that there is a path just off the ridge, to the east, which follows it in parallel most, if not all, of the way. So should the ridge be proving difficult, you could always drop down to that.
Only been on it once, so not got a perfect memory, but sounds like your plan is pretty sensible. And given you're asking on here, you're probably sensible enough to know when you're not happy, and bail accordingly!
Hope you enjoy