It is probably a very basic setup that somehow eludes me...
I wanted to split a mesh into arrays, run some array expression on the position Array and plug the resulting points back to the mesh. Basically I wanted an array expression to drive the deformation. However I see no obvious way to reassemble a mesh back from arrays. I thought of using a peak deformer and supply my customised normals and weights but there must be a better/easier way to simply replace point array in a mesh. Something like attribute transfer that uses point IDs (order) instead of proximity. Assuming that mesh2arrays retains the same order.