TL;DR
Substitute vanilla uranium mining and processing with Schall uranium processing mod .Edited to clarify.
What ?
As a nuclear engineer, I really like how the uranium front end is modelled in Schall's mod. Plus it is not overly complicated at all and player friendly (it is a game and not real life) :https://mods.factorio.com/mod/SchallUraniumProcessing
Please substitute the vanilla model with Schall's. Pretty please.
Why ?
Is a way more realistical representation of the real cycle.It can make the game more educational.
It is not more complicated than the Kovarex by any means. It only introduces yellowcake and separates depleted uranium, reactor-grade uranium and weapons-grade uranium.
It makes weapon grade uranium harder to get and you consume more centrifuge time and power by doing it.
It makes players think twice before using precious nuclear waheads.
It takes away the unrealistic chore of routing sulfuric acid to the ore fields. Instead, you use it in a centralised fashion in a tier 2 or 3 assembler to get yellowcake.