Ah Meph, you're missing the obvious! Ghouls using tools are for fools!
Personally, I'd be all for no ranged. Something about bumrushing enemies with a massive army of skellies and undead just set on tearing them limb from limb makes me feel all tingly.
But, there is an obvious solution: Organic weapons!
- (if possible) give them a breath attack like dragons or forgotten beasts, say a weak "Miasma Burp".
- Alter a pre-existing ranged weapon nobody likes (*cough javelin thrower cough* WHO SAID THAT!?) into a kind of "enchantment token" that Ghouls equip, or just call it a "Spitting Muzzle" re-name the ammo as "Bile" and have a squad of poison glob spitting ghouls! Their ranged could do weak bashing damage, but lots of poison, or piercing damage for a kind of "acid burn". Hell, strong ghouls could cause the "Melting" effect that lava does.
- If we really need something physical, then just give them a quiver full of bones. Like, literally. They're already a weak unit, just have a function like turning bones into bone bolts that makes them "throwable", and have ghouls toss femurs at the enemy to cause bashing damage. Bonemerangs. Or skulls. Carve skulls to be spiky, then throw them. Spike skulls. Point is ghouls are stupid and have sharp fingers: no bowstrings.
- They could also throw exploding maggots? Yeah I went there.