Re: the bar sinks, those are too small.
I'm going with laminate, so no undermount. No CounterSeal either. All too expensive.
As for design, since the IKEA is 15 x 15 (including ample space between), and the others are 14 x 16, I deduce from that that if single bowls were designed to be, say, 13.5" inner-width (15" outer-width), and 20" long outer-length (including rear-holes), I don't see why that shouldn't work.
Furthermore, even on those awkward corner sinks, I don't see why each bowl has to be a perfect square (or perfect rectangle). Why not eliminate alot of the triangle, to be replaced by actual-bowl-even-if-the-bowl-is-much-wider-at-rear, leaving just enough room for single faucet hole. At least that way, the faucet would be much closer to each bowl. Also, it's not as if there aren't double-lever faucets designed to fit inside one hole. And behind that, can be another hole for anyone wishing to install a filtration system.
Finally, thanks for the responses guys, but a brainstorm solution finally struck me last night, where I can probably use two of the Moens. Instead of the corner cabinet, I'd use a 39" blind corner for right-hand sink, and a 33" no frills cabinet for left-hand sink, with each sink placed at the right-most side of their respective cabinets. I rendered both alternatives via rough-draft GIFs on my amateur site.