My quest to find Osrim Chardz has finally come to end. I stumbled upon him on Evilbay for $8.99 Buy It Now labelled as a 'Rare Rogue Trader Era Dwarf'. Osrim of late has been up for sale ranging anywhere from $300-$500, so this was a great find, a very rare Citadel Dwarf. Originally available for order from the Bloodbath at Orc's Drift Citadel Scenario, there aren't very many miniatures still left in circulation.
I broke out the paints as soon as he arrived!