Radiotrophy is in a weird spot because it was a really long-standing feature request - dating back to the earliest days, like 2013-ish - that was always hanging around, but has always been a tough concept to crack because radiotrophy is so rare.
It’s also different from bioluminescence in that bioluminescence is widespread. We have concepts related to the part which can add better gameplay - oxygen tolerance effects and some sort of ability boosting effect via proximity (Bioluminescence - #7 by Deus) - it’s just a matter of manpower and volunteer work.
Radiotrophy however is inherently niche, and like Rathalos mentions, cannot realistically be a safety net. It is demonstrated by very few fungi in very unique cases. Uranium and other radioactive sources usually decay pretty quickly (atleast, their ability to produce a significant amount of radiation decays quickly), are usually pretty rare in nature, and have no apparent significant food webs based on the food source.
I do like your idea of non-LAWK radiotrophy being a prokaryotic part, and you make a good point - sure radiotrophy is niche and unique, but since you only can unlock it as a eukaryote, you already are dependent on other resources by then. Which is accurate - again, radiotrophs today do not sustain themselves fully on radiation. But hey, for non-LAWK, why not provide a prokaryotic part as an option, so radiation atleast can be a goofy playstyle.
Regarding OCD: I don’t think it’s appropriate to discuss this in too much detail publicly, and more can be discussed more privately. But is it related to a specific noise/texture/visual etc.? If it’s related to a specific stimulus - perhaps the ticking noise - that can relate to accessibility options which can help reduce strong sounds/visuals and the such. I’m sure many others can experience that, and that is the whole purpose of accessibility. If it’s related to the mere presence of something, that is a bit of a tougher thing to remedy.