The Spring 2401 story called ‘The Green Corsairs’ features some crossbow-armed orcs. These were relatively simple kit-bash style conversions, replacing the weapons the models had with crossbows.
Here they are before painting:
I used crossbows from the Empire Handgunner/Xbow box & the Free Company sprue. Just had to cut the human hands off.
Here’s the rear rank (in a marching pose):
And here’s the front rank:
Now here painted, but not yet based.