How to cut opening in 12" pilaster block-columns for electrical box (porch light install)?
Can you cut a groove in surface, and bury your conduit in that, then replaster/stucco the pillar.

Moving outside the box:

A:  Make it symmetrical:  that is, put a light on both sides. Now you have the same ugly everywhere.

B:  Hide the conduit in some kind of raceway.

c:  Be blatant and mount the conduit on the surface, then sheath the column with faux brick or stone.

D:  Trench in a line to a distance away, and use a floodlight