There should indeed be a neutral in your transfer case.... it is located
between 4H and 4L. The later neutral tow option is a computer subroutine
that stops the shift motor at the neutral position. The 4WD control in the
early models is relatively stupid compared to later models and I don't think
you could teach them this trick. Someone talented with electrical and a
knowledge of the shift plate arrangement in the motor head could cobble a
separate switch to allow this selection.

The usual caveates about watching the car roll off into the sunset because
the park brake wasn't applied before neutral was selected....