The nearest thing I can think of would be the Marauder Miniatures pike dwarves from ages ago, the leader had a fantastic Morion helmet and pistol. I thing the guy who did these gave them longer spears, I remember mine being much chunked.... just checked other pictures and they are normally much stouter.

Good basis for some conversions though!
Wow, how unhelpful am I? Those are 28mm, so useless for you...d'oh!
Best of luck and it sounds like a great project.