I do them with wordpad in windows xp.

 

The start of the pose looks like this

{
version
{
number 4.01
}
actor head
{
channels
{        
            targetGeom PBMCC_30
            {
            name v3overbite
            initValue 0
            hidden 0
            forceLimits 1
            min -100000
            max 100000
            trackingScale 0.02
            keys
                {
                static  0
                k  0  0
                }
            interpStyleLocked 0
            indexes 4336
            numbDeltas 38284
            deltas
                {
                d 32329 0 -0.0003809929 0.002667001

 

and the end looks like this

                d 36664 0 -0.0003809929 0.002666999
                }
            blendType 0
            }

}
}
}

the d lines are the morph deltas .

 you can get most of this from the saved cr2 containing the morph.

change the targetgeom line to one of the empty morph channels PBM_CCxx

make sure the actor line is changed for the body part name.

from targetgeom to the } after blendtype is from the cr2.