There is no utility that can achieve this exact requirement. What you can do is to handle the OnClientPasteHtml
event and implement your own stripping logic.
I have just created new article on the topic. It will be life shortly, but for the time being you might find its source helpful—https://github.com/telerik/ajax-docs/blob/master/controls/editor/how-to/strip-html-on-paste.md
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