WoWInterface - Get ItemID on hover

Hi all
I would like to find a way to get an itemID from an item that I am currently hovering over using a keybind.

So far I have been able to get this working by hooking the "OnTooltipSetItem" function as follows;

Lua Code:

local tableOfItems, itemLink, itemID = {}, "", ""
 
GameTooltip:HookScript(
    "OnTooltipSetItem",
    function(self)
        _, itemLink = self:GetItem()
        if itemLink == "" or itemLink == nil then
            return
        else
            itemID = tonumber(strmatch(itemLink, "item:(%d+):"))
        end
    end
)
 
function ADDITEMTOLISTFUNCTION()
    if itemLink == "" then
        print("no item found")
    else
        addItemToList(tableOfItems, itemID)
        print(itemLink, "added to list")
    end
    itemLink = ""
    itemID = ""
end

Though this does work it will pick up any item when I mouse over my bags no matter how fast I move even while not pressing the player set keybinding.

Is there a better way to get the itemID only whilst pressing the keybind?