Another option would be to score, or emboss the wood that is already there.
Turn an Xacto blade backward and insert the blade into the handle/holder, then
use the square mounting side of the Xacto to press lines into the existing wood deck.
Premeasure the spacing, and be sure to use light pressure, and a straight edge.
The "tool" will want to follow the grain of the wood, so heavy pressure and the wood grain will
want to make crooked lines. So working slowly and carfully would be key to good results.

[8D]