Why not 2"x3/8x12? Here bigger is always going to be better. And frankly the extra weight and cost would be minimal.
While G2 titanium is fine, you would need to resize the mess of it. G5 is substantially stronger, so much so that you can go much smaller and keep the same strength. So small in fact that when the company I used to work for has a set of chainplates redesigned for G5 everyone (including the engineer) decided they looked to small and put in bigger ones. They were probably fine, but it just looked wrong.
Give Allied Titanium a call. For a couple of 12" straps with no bends I would be suprized if G5 would really be that expensive. And at roughly four times stronger than 316, you could go silly small, if we assume a design load of 18,000lbs, in G5 you would need about .15 square inches of working metal total (ie the area to the side of the bolts). I would also recommend G5 bolts, just to prevent a dissimilar metal issue. But not required.
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