scheme markup macros

[Graham Percival]

Is it possible to define a \markup macro that looks like a lilypond 
command?

This produces the output I want:

\version "2.5.23"
#(def-markup-command (tempoMark layout props str) (markup?)
  (interpret-markup layout props
    (markup #:bold #:large str)))
\relative c'' {
  c4^\markup{ \tempoMark Allegro }
}

I'm wondering if I can alter the syntax so the command is used like 
this:

\relative c'' {
  c4^\tempoMark{ Allegro }
}


Cheers,
- Graham