Hey, with the bayonet, I reckon that maybe it should be like the mortar. You click "Reload Bayonet", but rename it to something like "Attach Bayonet". It then plays an animation, like when you attach the mortar to the M16, and then changes the model to the bayoneted version.
Ace!
BTW Lobster there's a bug in the latest version of the US WW2 Pack (Ver 1.7). If you try to use the US Army Officer (only that one) OFP crashes whining about some model being NLOD Format. I will email the WW2 team with exact figures.