Got a bit carried away with excitement, and tried to combine the multiple blocks with the etched lino. I transferred the line image of the cellist onto another block, and then etched that block, carefully applying the caustic soda only to the area within the line image. This is what the etched block looks like when printed in black:
Then I printed the original line block over the top:
Well, it's worked in parts: the etched bits give a nice, unusual, texture. And failed in other parts: the face on the etched block didn't bit, giving too much black there.