I too prefer micrometer dies, and am also very anal about my precision loading. And perhaps a bit OCD with it. I am a machinist and automation machine designer / builder that does still remember how to read a micrometer and vernier caliper. At my current age and imcome with no more children to put through college I can afford these fancier dies, and really don't care to make them myself even though I could. That being said, the old screw and lock nut will work just fine, and once set, if you don't intend to ever move it, why do we buy the micrometer dies? Especially if we have multiple rifles in the same caliber? Because we can, and want to.
I am going to add another item to the list of must haves for us who strive for repeatability. I found these 7/8-14 threaded shaft collars the I put on all of my precision dies. Thought I would share them with you all.
Shaft Collars, for 7/8"-14 Thread Size, Black-Oxide 1215 Carbon Steel
https://www.mcmaster.com/6438K28
In my opinion they work best.