Toribash
In theory, disabling the items will work - as far as I know, the best method is to disable the items and then delete the files from your custom folder. People who've already downloaded your textures will still be able to see them until they also delete the files from your custom folder.

If that doesn't work, skulfuk's method is best.
"Call yourself alive? I promise you you'll be deafened by dust falling on the furniture,
you'll feel your eyebrows turning to two gashes, and your shoulder blades will ache for want of wings."
Since 3.5 the game re-downloads your textures even if disabled/deleted. I'm guessing it's not been a priority for Nabi since there's not many people wanting to disable textures once they've got them.

<Erf> SkulFuk: gf just made a toilet sniffing joke at me
<Erf> i think
<Erf> i think i hate you