[New Support Gem] Remember Frozen Orb from D2?

This support gem (let's call it Orb) could be used on any projectile spell (edit: see my 3rd post below), which means: a skill with both the Projectile and Spell traits. Right now, that's Fireball, Spark, Freezing Pulse, Ice Spear, and Ethereal Knives. Instead of firing the spell's projectile(s), an Orb projectile would be fired; this projectile would itself fire out many of the spell projectiles rapidly and in random directions as it travels. Contact with the Orb projectile itself would do nothing; it deals no damage (directly) and has 100% pierce (although the projectiles it fires might not).

[Edited content follows]
Chain, Pierce, and Fork supports would always effect the spell projectiles, since they can't effect the Orb itself (100% pierce). The support gem might reduce damage effectiveness, increase mana cost, and/or add a cooldown.

Options regarding other support gem interactions, feel free to give your suggestions:
*Lesser/Greater Multiple Projectiles (I'm leaning Option 2 for simplicity)
Option 1) Increasing the number of projectiles with a support such as Lesser Multiple Projectiles would increase the number of Orbs fired at once, but would not increase the number of projectiles fired per Orb. Skills with additional projectiles built into the skill itself (such as Ethereal Knives) would only fire one Orb by default; the additional projectiles there are fired by the Orb instead of granting additional Orbs.
Option 2) The modified skill always fires a single Orb; the support gem modifies the number of projectiles the Orb fires at once.
* Faster Projectiles (I'm thinking Option 1)
Option 1) Both Orb and spell projectile speed increased.
Option 2) Only Orb projectile speed increased.
Option 3) Only spell projectile speed increased.
* Spell Totem (I'm thinking Option 1)
Option 1) Creates a totem which fires Orbs.
Option 2) Supports do not stack; Orb support has no effect.

So what do you guys think? Good idea or not?