As per my PM to you (why PM then post, eh?), the Twin will work, but is futzy. As Bryan confirms, a Single/Dual will be better, and even better is to swap the "Y" arm for an "I" arm.
So can you have a DP Twin getting 119/110 and, though overkill for the job, another DP Twin getting 61.5? Can both outputs be used to run through 2 DP21 switches (guessing no)?