Quote - I've tried transferring deltas without PMD (by embedding the deltas in the INJ PZ2), but the results were screwy (if I recall correctly, the dials were either invisible or ineffectual).

A PMD injection can create a new channel in the figure, eg:

                targetGeom <span style="color:rgb(0,255,0);">LongNose</span>
                        {
                        name LongNose

A normal delta injection can't create a new channel in the figure. You have to inject into an existing channel, eg: targetGeom PBMCC_28 { name LongNose

Perhaps that is where you were running into difficulties.