I haven’t been able to just Pierce just a single Dot but I have been able to cut .040" holes in 26 galvanized. I too wanted to just Pierce a single Dot but haven’t been able to select that geometry properly in fusion360 cam.
I cut a lot of .188 and .22 holes in my programs, I almost never have to re-drill them. Seems to be accurate enough for screws ,rivets, cleco’s
I do a little bit of line cutting like this with fusion 360. this is 14 gauge stainless steel.
If you post your DXF I could take a look at it and help you with your geometry selection.
But yes if the lines connected you should be able to cut the whole line in one go.
I did post a video on here a while ago about selecting that kind of line geometry to see if I can find it.