Yeah, those modules are cheap too on eBay ($25). That's what I would most likely do, installing two of those in the back to give me the spec'd 12x SPF+ ports.7450 supports the 4x SFP+ modules in the back slots; I needed more ports and just bought another 4x10G module and it worked fine. As far as I have found, it does not have the commands to enable breakout and all the documentation I found for configuring 40g breakout applies to the 7750. I don't know why the breakout cable is listed unless when you use the breakout QSFP it auto-configures the breakout.
And it leaves a good upgrade path in the future: I can add another switch and swap back in the QSFP+ module to link them.
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