The generator's outer fabric isn't super tough and you wouldn't want to abuse it. Stronger than it looks though, so should do fine if just packing into rucsac and throwing on from time to time.
But if weight isn't a real issue no reason not to go tougher
Certainly the outer fabric on the barrier stuff is a little heavier than the generators so should be a very plausible option. There are/were pullovers/jackets about in a bunch of places last winter so maybe some on sale now.
Montane's flux perhaps too. PHDs sigma stuff maybe.The prism too, although thats not hugely insulated. Haglofs fit kind of like RAB, a bit taller/thinner than ME perhaps. They all vary within their ranges anyway. Paramo's Torres stuff uses a really tough outer fabric.
(Variant/Baltoro not really ideal for such use.).
From the Cotswold's sale the chulu2 and Wolfskin Microheat should be entirely competent jackets.