It's doubtful that you would have any problem with this setup, though with the drivetrain config. I would imagine you ending up with a more obtuse isoceles triangle. However, we used a similar chain route before in our drivetrain, using #25 chain, and never had a failure. With an 10 tooth sprocket, and about 70 degrees of chain contact, we never had a problem. Not saying it can't happen though. However, as was said above, by mounting small idlers in the middle of the sides of your chain triangle, you will increase reliability and accordingly chain wrap. These idlers, if adjustable, also make it very easy to tension your chain. Which is a good thing.
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