You could try doing a stop mitre on the boards on the reveal. Cut a 45 along the exposed edge of the board using a track saw or table saw and another on an offcut of the same length. Put them on a flat surface and push the 2 points of the 45 degree cuts together so they touch and back this with masking tape on the face. Then flip the whole thing over and put a bead of CA glue along one of the cuts and pull them together, give it a spritz with accelerator and it will hold. This way it will look more like solid birch than birchply.
You could try doing a stop mitre on the boards on the reveal. Cut a 45 along the exposed edge of the board using a track saw or table saw and another on an offcut of the same length. Put them on a flat surface and push the 2 points of the 45 degree cuts together so they touch and back this with masking tape on the face. Then flip the whole thing over and put a bead of CA glue along one of the cuts and pull them together, give it a spritz with accelerator and it will hold. This way it will look more like solid birch than birchply.