Well, ok, my bad. Using Inkscape…
"Easiest way to do it is to not think about it.
Draw your design.
Set the design so it has no fill color, and set the stroke width to match the full width of the laser kerf - I tend to use .007" or .008".
Expand (Or Convert Stroke to Path) then break the design apart. This gives you “kerf-adjusted” paths for the laser. The “inside” or “smaller” paths would be used to cut the hole out of the main material. The “outside” or “larger” paths are used to cut the “plug” or “inlay” from the other piece of material.
Theoretically this makes a 0.000" fit tolerance between the two pieces but natural materials like wood or other compressible items might need a little overlap to press fit tightly while two pieces of acrylic ain’t gonna go together this tightly (maybe allow an extra 0.001")
So in Inkscape I duplicate the design, (Control D on a Windows box). Proceed to prepare each as described above.
On the first copy delete the inner path, the remaining outer path is the cut for the inlay piece.
On the second copy delete the outer path, the inner one is to cut the hole the inlay goes in.
Regardless of how wide you set the stroke, the laser sees its path right down the middle - unless you do “Path to stroke”.
Then inkscape places a stroke on each side of the path. Its those two paths that you delete one of depending on which of the hole or the inlay you are working on.
In Inkscape going to “View>outline” is a handy way to check a design to see if it is as you expected.
Continue to explore the subject along with any other holes in your understanding with the tutorials here and the search function.
Happy reading - and exploring!