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Surely butyl tubes get lighter by being thinner? Being as latex is more puncture resistant than butyl in the first place, using even thinner butyl tubes isn't appealing.
Although latex is more permeable (I stick to butyl on my daily bike), it doesn't lose pressure that quickly. Although if you're running 23mm tyres, the loss will be more noticeable as you'll need to run them at a higher pressure than, e.g., 25mm tyres.
GP4000S will trounce OC for durability.
But, like you, I carry a butyl spare for the same reasons.
Scilly.Suffolk
I went with Vittoria open corsa cx 23s and conti supersonic tubes on shamal ultras for a recent alpine trip. Held up well in a thunderstorm with forked lightning on alpe d'huez and Col du Granon descents in torrential downpours.
Wanted to avoid the air bleed you get with latex tubes whilst shedding a bit of weight and have found that supersonics hold pressure well. Vittorias have been great coming from gp4000s- ill wait and see if they can match longevity of contis.
Make sure any back up tube is a standard thickness one as i would not want to be on the side of the road trying to delicately fit a thin tube with cold hands.