I have had an interesting "compromise" idea: one way to get SH4 crew in (at least the heads) might be to attach the SH4 heads as "child" objects to the SH3 heads in S3d, maneuver them into the correct position, and then toggle invisibility for the original (SH3) heads. The heads will of course not be animated, but it's better than nothing. Plus the ordinary seamen in SH3 never speak, so you would just lose the lip movements that occur with the officer models.
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