I'd like to use Reallusion software (+Blender?) to create a 3D "talking wall" character (see reference images) and animate it with motion live. Can anyone suggest a workflow for this?

I've tried using the Blender CC3 plug-in to bring a CC3 character into Blender and sculpt its face into a wall shape, but it's virtually impossible to do without changing the face topology. I also tried modelling a face from scratch in Blender and rigging the eyes and mouth with Rigify, but preparing it in 3DXchange seems overly complicated because it's only a head rather than a full character. It seems like something that should be dead easy to do, but I can't figure out the right approach. Any suggestions? By the way, I'm a 3D character newbie, in case you hadn't already surmised.