Diagonal slashes in drum notation

[Brett McCoy]

I am doing some drum notation, starting out with a 2-bar groove, and
then for the following measures I want to just have 4 diagonal slashes
to indicate drummer "basic time" (rather than the % sign to indicate a
repeated measure). Basically, I want to do something similar to the
isolated % repeat
(http://lilypond.org/doc/v2.12/input/lsr/lilypond-snippets/Repeats#Isolated-percent-repeats)
but for quarter note diagonal slashes. Not sure how to go about this.

-- Brett
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"In the rhythm of music a secret is hidden;
    If I were to divulge it, it would overturn the world."
               -- Jelaleddin Rumi