Will have to decide what you want out of this I guess - is it purely very short distance camp site duty? Or sane enough to use in pubs/B&B's etc at need? Or even, in extremis, potential back up footwear for a day or two?
Inov8 recolites would do all of that at ~200g/shoe and an awful lot less bulky than crocs. The Salomon things similar, unsure if you could get them quite tight enough for proper walking.
Can go lighter of course - the lightest inov8 shoe currently seems to be 150g/shoe, although 160g/shoe for the lightest X talon. Or Saucony's hattori (~125g), those Merell foot gloves etc. These are all rather pricy for the use but would do everything.
Or if just round camp stuff like the integral design hot socs that ultralight outdoors gear have.
Or plenty of very light things from the BPL folk above