How to lock deformation curve point


Is there any way to lock or hold on x,y,z position of deformation curve point ,but important to make it locked relative to master peg x,y,z position, not relative to native offset of deformation?

Or maybe there are other solution of my practice problem: i have first drawing layer with deformation in envelope mode and second drawing layer with deformation in curve mode (2 points-offset and curve) connected to curve from first layer deformation; and when i doing some deformation to first layer i need apply this position deformation to second drawing layer offset , but second drawing layer curve must stay unchangeable relative to master peg of first drawing layer (notice, master peg stay without changes whole time).

I would be appreciate for any help.

P.S. surfing this problem in web,docs,guides has no result.