Depends on if inventories still work the same as last time I came across this.

K, last time it required returning the original texture item (didn't work with any others for some reason) then upload a blank/all alpha texture followed by disabling it. Of course that'd take forever since it would involve tracking that item.

Since textures have changed & users can have multiple ones/transfer them etc it should be possible with any texture item, upload a blank one then disable.