I used to have a Britishwooden entrenching tool handle that had a bayonet lug on it for the No 4 bayonet. this was on the small end of the handle, opposite of where to tool head would be placed. It was missing the metal head which I believe had a pick on it. In any case as it was it was supposed to be used for mine clearing, the bayonet used as probe.
The other home use for the no 4 bayonet is as a candle holder on Halloween. US custom to put out lights and let the kiddies get candies from you, used the candle lit No 4 Bayonets to line the path to the door. Tried it once, worked kind of well though the wax got in the internals and I never did that again as it took forever to get the wax out of the push plug.