You heard my vote at paint night...
the white shoulder pad is both sigismund approved and adds some great contrast to the model. Plus it gives you an opportunity to do some great freehand which you've already done on that test model.
I love the storm shield /"what this? this is just a decoration" conversion. Very smart and even more space for templary goodness.
Apothecary conversion is nice... prime him white!
the captain is great, the laurel wreath hanging on his shield is nice and the burning sword is soon to be a classic relic blade conversion.
I notice none of them have shoulderpads yet... Are you planning to prime them seperately? If so, prime the bikers black and the shoulders white!
One last thing on the red shoulderpad. There is no precedent in the most recent codex for sword bretheren assault squads, which is what your command squads on bikes would be representing using 'counts as'. Since the black cross on red field with red trim is almost a straight juxtaposition of the standard sword bretheren markings, you could use that to show the command squad unit. Or, you could revise the command squad to be black shoulders with red cross and red trim, to indicate that these are just sword bretheren who borrowed some bikes from an assault squad.
I may ask to see a boltgun metal trimmed bike with a white and red shoulderpad at next weeks paint night, just for true anal retentive codex color scheme accuracy. But I am liking the red trimmed bikes. Just want to take the pepsi challenge on this one.
oh and tell us about what crusade they are on, and how about a device for that particular crusade.
Go and paint! This is a great project!