Just make Explosive Rocket Demo 1, AP Rocket Demo 2.
Demo is fine, really. Just have to make up your own creative uses.
Also, you can max it out and still get 2 levels in other stuff.
Mines/remote detonators are lulzy, but cause too much butthurt.
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Perhaps a HandMine- a "game compromise" claymore that cannot be ground planted due to abuse potential, but can be used from active slot. (And must be reloaded 1 at a time from inventory.)
Say 3 Junk, 3 MP, 1 Wood, 1 Electronic Part, 5 frag grenades, 1 hour crafting cooldown. Equal to 1 burst from an Avenger, always hits all in burst cone. -10 DR. 6 AP to use; does not work with BRoF or Fast Shot. Knockdown as SuperSledge or rocket.
Demo 2 Improved HandMine is regular HandMine plus a dynamite and 2 more junk and 2 more MP. Damage as regular handmine plus 3 levels of BRD. -25 DR. 30 minute crafting cooldown. AP to use as regular HandMine. 50% better knockdown than regular HandMine.
Damage type? Explosive or 50% explosive/50% Normal (shrapnel).