[sirinsidiator]

Your second attempt is almost correct, but the game uses ZO_Dialogs_ShowPlatformDialog instead of ZO_Dialogs_ShowDialog for these two.

ZO_PreHook(
    "ZO_Dialogs_ShowPlatformDialog",
    function(dialogName, data)
        if dialogName == "RECALL_CONFIRM" or dialogName == "FAST_TRAVEL_CONFIRM" then
            FastTravelToNode(data.nodeIndex)
            return true
        end
    end
)