What I did for poly blend shape using nurbs eyelashes...
Use a script called CrvOnPoly It is available on A|W's site in the Ducan Brinsmead tutorial on Pfx for Hair. You can select a line of edges, and make a curve along them that updates wioth history (so when you blink or squint, it moves with the polys) What I then do is use this curve to loft or boundary aome geometry for the eyelashes.
Perhaps you can use this curve to control your exisitng mesh?
(For my eyelashes surface I made the duplicate curve for the loft using offest curve and keep original on, that way I have two curves that update with the moving poly mesh, that I can loft between)