How about this, the Bloodletter is a melee weapon.
Pros:
+15 hp
+20% damage
The Bloodletter gets a 3 out of 1 bleed chance(or not, but it is named the BLOOD Letter).Bleed damage 4 per 5 seconds.
Upon kill you get healed +50 hp, on assist +25 hp.
Taunt Kill: Scout can slash and stab the opponent. And it is a high risk reward move because it restores health fully. As a animation Slash, slash and stab.

Cons:
15% slower swing speed.(or even more, I suppose)
Bleed effect and possible other effects are treated as a assist.
You need to hit the enemy at least once with this melee to activate HP gain.
Bloodlust:First time active, you need to bathe the blade in the blood of your enemies, as in get a kill so you can change to your other weapons. Or even cause the bleed effect.

I think that this weapon would be a good Scout version of the Half-Zatoichi. In actuality I think that it is a bit of an Half-Zatoichi and Boston Basher. Thatt said, proposed crafting recipe: 1 Boston Basher +1 Half-Zatoichi + 2 reclaimed metal= 1 Bloodletter.

This are my suggestions, please keep it civil. No flames no raging thank you.

Edit: added some cons and more explanations, and a crafting receipe.

Important edit:

New idea.

The Cleaver and the Bloodletter have some new mechanics.

On Primary fire, you strike with the Cleaver or Bloodletter and on kill with melee you get HP that can overheal, maybe small Health kit for Cleaver and medium Health pack for the Bloodletter.

And on alt fire you throw the Cleaver/Bloodletter for the throw damage and bleed?

The real kicker?

You can equip them either in the secondary or the melee slot, and in both for max 2 of them.