Use a stripped v4 donor rig, same as any v4 specific conformer on mp. Used to be a blank v4 floating around out there for such a purpose (I have it). Not seeing the problem...

A stripped CR2 stil uses the V4 joint centres and fall-offs - it's there to avoid having to contend with the morph channels. DAZ allows the use of one of its figures' joint setting to create a support item - something like clothes or hair that is, usually, used as an add-on for the base figure - but not for the creation of stand-alone figures. However, looking at your screenshot it's not immediately apprant whey you can do this as a character - texture and morphs - for V4, which would not normally be a problem (as long as any morphs from DAZ or third-party sets were not embedded but were set as dial values, with only hand-sculpted morphs included as deltas).