standard practice for fixing a thread and riser to an open string step?

Ive 2 steps without a handrail and the left side is open string. Whats the best way to fix these to the string? Not interested in dowels or pinning and filling.

Im thinking either a batton underneath screwed up into the thread an across into the string. (same for the riser)

Or

Drilling 10mm pockets and screwing straight through the face and plugging them.

Which is industry standard or best practice. Obviously if I had bannisters I could hide the fixing that way but is there any tricks for this in joinery. Carpenter by trade but dont do much joinery at all TBH.

Cheers