I made my own chain-guides on rear of my R'off bike friday P. Llama and added a chainminder around the frame
to stop the chain from coming off the chainring towards the inside..

Before there was a tendency to have the chain come off , backpedalling to oil the chain.. ( P.Llama needs the chain tensioner)

On topic, which hub makers ? do people have a few years of reliable service out of their 2 speed IGH?

Its too hilly here to consider one for myself.. unless I stick to just the river shore MUP.