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Hmm.. bulky. I reckon stuffing the kit down the neck of my jersey is probably better. Since it's a 600 it's no great shakes stopping, folding it up and storing it more neatly in a spare pocket I guess. I could carry less food and buy more at each control. I finished the 400 with spare drink powder, spare bars and spare gels. I could just expand the saddle pack a little and that would leave a pocket free for arm/leg warmers.
Alpkit do their lightweight ones in those sizes but they don't have any attachment points.
Do you reckon a feedbag-type thing might work with your bar set up at all? https://www.revelatedesigns.com/index.cfm/store.catalog/Cockpit/Mountain-Feedbag