Prevent the Editor From Moving My  

It’s a simple solution/workaround, but a Shortcode could be used.
As birgire noted, the whole anchor can be the Shortcode.

And for ease of use, this article has a solution: adding a shortcode button in TinyMCE. You could have a dropdown with a selection of anchors, turning the fight in your favor 😉 WP editor is really a PITA when it comes to this kind of characters/entities control.

And the best related Shortcode -> TinyMCE answer that I found here at WPSE.

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