AutoCAD .NET :: Modify Tooltips Of Ribbon Items

We want to deliver a language independend CUIX-File and translate the UI at runtime after loading the CUIX like this:
 
foreach (RibbonTab tab in ComponentManager.Ribbon.Tabs)
{
foreach (RibbonPanel panel in tab.Panels)
{
foreach (RibbonItem item in panel.Source.Items)
{
TransRibbonItem(item);
}
}
}
 
TransRibbonItem(item)should translate the Item text displayed in the UI as well as the tooltip text.
I found a good way to translate RibbonItem texts. But the only solution I found to translate tooltips is the approach that Kean Walmsley posted in his blog here and here.
 
This solution has some drawbacks: It uses Autodesk.Internal.Windows.ToolTip, which Kean rates as "risky". It can not be used in my TransRibbonItem(item) function because it uses an ToolTipOpened event-handler that modifies a tooltip just when it is created.I found that this mechanism does not work very well in AutoCAD 2014: When a tooltip is created the first time, the handler is called before it is completely initialized. The posted solution reloads the tooltip in this case - which leads to a delay and display flash.