I love idea of those Hangers on. They are not normally deployed during the games but could be cached loitering around when gang home turf is attacked. GW haven't released models for any hangers on yet (but some were previewed) but IMHO its much more interesting to built your own. Additionality to being hanger on he will be member of my Hive dwellers usable in some scenarios when Gangs fight inside of settlement.
He started life as Perry plastic XV century mercenary, but equipped with Victrix Napoleonic backpack, lamp (using his original pike :) ) and portable ladder Ive built from plasticard he is ready to light the lamps in the underhive.IIRC head is from Frostgrave cultist sprue.
And whole bunch of Hive dwellers I built (some of them still WIP - they take me a loong time :)
40k civilians are really useful for any narrative scenario but hard to come by.