Tweaking within markup

[Nick Payne]

Is it possible? I want to put a parenthesized natural above some notes. If I
do it within a single markup, the natural sign is not aligned with the
parentheses, and I haven't found any simpler way to get them aligned except
by having the left parens, the natural, and the right parens each in their
own markup and tweaking each one individually. Is there a simpler solution
or not? Eg.

\version "2.12.2"

\relative c'' {
        <c'-4>16^\markup { (\teeny \musicglyph #"accidentals.natural") }
<e,-0> 
        <a-1>-\tweak #'extra-offset #'(-0.5 . -4.3)^\markup { ( }
        -\tweak #'extra-offset #'(0.5 . -1.8)^\markup { \teeny \musicglyph
#"accidentals.natural" }
        -\tweak #'extra-offset #'(1.3 . 0.8)^\markup { ) } <fis-2>
}

Nick