Data Transfer - add material assignments

I'm working with some terrain meshes inside a game engine which has multiple materials assigned to it which are blended in engine via vertex colours. I regularly remesh the terrain with QuadRemesher which does a great job, however I lose all the per face material assignments. Vertex colours are easily transferred with the Data Transfer modifier, but transferring material assignments doesn't seem to be supported yet.

As a reference, Maya has a similar feature called Transfer Shading Sets that allows you to project materials from one mesh to another.