There is no difference between G2MtoM4 and LF2to V4.

Exept that the G2MtoM4 is easier, especially if you have the M4 legacy shape for G2M.

Load M4, add G2M to the scene and fit him over M4.

Take especial care of the hands, as even with the legacy M4 shape, G2M and M4's hands are different.

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Combine the hip and waist into a single object. (This actually can be easily done using the grouping tool)

(If I remember correctly the eyes have to be renamed, too. But I'd have to check that)

Export as object. Import again.

Use the Setup room to transfer G2M's original rig for the correct head rigging, then transfer the M4 rigging directly in the Pose room, to get the correct body rigging.

Maybe adjust the rigging here and there if necessary. Done.

(I used my weightmapped M4-17K as the rigging donor)

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BTW, this already IS "higher level Poser tech". In my experience hardly anyone will ever attempt to do something like this.

99% of Poser users can't even  pose a figure from scratch, less alone modify it from the ground up. (And there is nothing wrong with it, because that is what Poser is all about: Saving you from having to do everything from scratch so that you can spend more time rendering)

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So, my intention is not to teach the average Poser user how to do it. (Although I'd be happy if someone would try it out)

But to give a "proof of concept". THIS is what Poser could actually do, so that they are less satisfied with what they actually get.