Why are you exporting to obj files to begin with? These are dial-spun morphs, right, and just for your own use? Why don't you just save a pose file? When you're asked to pick what you're saving, deselect everything, then just reselect the head. Or am I missing something?

Pose library > Add to Library > Select Subset

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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