Have a browse though the INQ28 painting and modelling section for in a forum called
"The Ammobunker"
and otherwise search for inq28 inquisimunda blanchetsu
I've done something similar to you.
Some useful kits:
Empire archers - nice models and leg poses
empire flagellants - lots of bits and useful arm poses for improvised melee weapons ragged clothing .
empire crossbowmen / hangunners - with some skill with a blade the crossbows can be replaced with
FW DKoK lasguns.
The
FW renegade arms are good for adding variety and some improvised weapons.
If you are not limited by wanting to use only
GWs parts try Victoria miniatures for extra parts.