Adding a taunt to a misc?

[SwollyMammoth]

Ok, so i made two flintlock pistols to go on the soldier's chest as a misc and submitted it to the team workshop. Recently, there was a question asking about the taunt where he takes off a grenade and blows himself up. I know that would look really weird, blowing himself up with a pistol, so i want to edit the taunt. Is there a way to edit the taunt where he kills himself and submit that with the misc? If so, i need to know how to make a taunt and how to submit it with the misc.