I, too, have, for many years, used the bulb in a plug-fuse socket as a temporary current-limiter for troubleshooting, and I still use a bulb in a rubber socket to connect in series with a breaker. I don't sweat the temporary EGC-path current.
The bulb as a current limiter for model-train rail power is not a new idea, either. The resistance of a cold filament is a fraction of the hot filament resistance, which is why it has minimal impact on normal operating current.
