"Or better yet, how to break them up into a pair of Cr2 figure files that would conform perfectly to V4?"

Quite a loaded statement right there. Create a perfectly functioning conformer for v4's 0 foot joint positions out of a model not purpose built for that. Rigging shoes that work well with v4's feet can be a task. Do you have a modeler? Do you know how to use the grouping tool? Have you ever changed an objects center/origin with the joint editor? Familiar at all with the set up room or transferring a donor rig to a grouped mesh? All of these questions are something you might want to consider before embarking on this path. Even if the answer is a confident "yes" to these questions, you're likely to run into many snags along the way. Can't really recommend any tutorials unless you are somewhat familiar with the concepts above. I would start with familiarizing yourself with the grouping tool. If you don't use an external modeler you'll need it to break the .obj into 2 objects, regardless of the .cr2 or parented props choice.

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