Hmm, well the third exercise of each day is bicep, tricep or calf work so I don't think that's an issue. The inability to superset on the push or pull days is probably more of an issue from a flexibility of the routine perspective though (i.e. when short on time). Like I said, it's still under consideration (partly because I haven't done much 5x5 work so I thought it might be a good change).
Perhaps the answer is to alternate between your method of push/pull/legs and this other way.. hmm. Cheers.