I am approaching thread milling for the first time...I need a whole lot of 1/2-13 holes threaded 1 inch deep in 12L14

Wondering what the pros and cons of the single lip miller such as Tormach sells vs full depth cutter like Maritool sells.

Also considering grinding down a "trial thread miller" from a carbon steel tap , a 3/8-16 or 7/16 and leaving just one thread like the pictures of the

carbide single lip millers ,........ just to see the process work one time ....at somewhat reduced thread depth....... and verify the feeds/speeds before trying an expensive carbide cutter.

Any thoughts?

Dave Lawrence