Icons for "Show Assistant Previews" and "Show Painting Assistants"

In the process of refining my toolbar, I noticed that “Show Assistant Previews” and “Show Painting Assistants” have no icon associated.

This makes both rather heavy consumers of toolbar space. As for the Assistant preview, the icon could be as simple as an axial system, like so:
afbeelding

And show assistants maybe like so (just like when you drag the vanishing points out):

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