Problem with UseInventoryItem()

[Benalish]

I'll resume this topic for a moment: https://www.wowinterface.com/forums/showthread.php?t=59470
Since UseInventoryItem() seems to work only on inventory slot right click, I created this script that alarms when you try to disenchant an item you don't want straight from your inventory.
This script works with the original interface of the game: but if someone used an addon, would it still work?
Of course, better solutions are welcome

local mt = {
    __index = {
        isvalue = function(t, value)
            local is = false
            for k, entry in ipairs(t) do
                if (entry == value) then
                    is = true
                    break
                end
            end
            return is
        end
    }
};
 
 
local protected = { "item1", "item2", "item3", "etch." }; -- items I want to protect
setmetatable(protected, mt);
 
local disenchanting;
local antidisenchant = CreateFrame("Frame");
 
antidisenchant:RegisterEvent("UNIT_SPELLCAST_SENT");
 
antidisenchant:SetScript("OnEvent", function(self, event, ...)
    if (event == "UNIT_SPELLCAST_SENT") then
        local item, link = GameTooltip:GetItem()
        if (arg2 == "Disenchant") and (protected:isvalue(item)) then
            disenchanting = true
        end
    end
end);
 
antidisenchant:SetScript("OnUpdate", function()
    if GetMouseFocus() then
        TargetItemID = GetInventoryItemID("player",GetMouseFocus():GetID())
        if (TargetItemID) and (string.find(GetMouseFocus():GetName(),"Slot")) then 
            local name, link = GetItemInfo(TargetItemID)
            if (disenchanting) and (protected:isvalue(name)) then
                DEFAULT_CHAT_FRAME:AddMessage("WARNING! YOU'RE DISENCHANTING "..link,1,0,0)
            end
        end
    end
end)