Escapes in insane macro shortcuts

Literal backticks and dollar signs can be produced witha backslash escape as in:

a ` $ b

It is not possible to escape backticks (`) inside an insane inline code, or dollar signs ($) in insane math.

The design reason for that is because multiple backticks produce block code.

The upside is that then you don't have to escape anything else, e.g. backslashes (\) are rendered literally.

The only way to do it is to use the sane syntax instead:

a b ` c d

a $\sqrt{\$4}$ d

Within block code and math, you can just add more separators:

code with two backticks
``
nice