I only use the whole body if multiple groups are involved. Otherwise, yes, I export from Poser.

I think what you're trying to do is problematic if it's for redistribution, as exporting things done with Morphs++ as an object will mean that Morphs++ won't be called by your new morph. Which DAZ definitely won't like. I would work in the opposite order: due your sculpting in your third party app, then use Morphs++ to fine tune.

SyrINJ (and numerous other apps, I presume) only works for a figure with injection channels built in. Otherwise, you pretty much need to use PMDs, I think. But since you're talking about V4, that shouldn't be an issue. However, I don't think I've used Poser File Editor, so can't give you any advice there.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3