J.Quondam
CR 1/8
That's a good call.Not to sound like an ass but there are other games better suited for what you want. The One Ring rpg is geared more toward “The Fellowship” and less about “fighting.”
I really like OPs save to remove the exhaustion mechanically associated with so much killing. But dealing with ptsd a weird thing in bog-standard murderhobo D&D. But it does fit in nicely with TOR. That said, I thought AiME has a similar mechanic? I don't have my books to check, but a variant on that could be a viable 5e approach.