String number in a \markup

[David Stocker]

Hi folks,

Is there a way to insert a string number into a \markup? What I need is 
to indicate a scordatura for a guitar piece like this:

\markup {
 \column {
   \line { \small "5 = G" }
   \line { \small "6 = C" }
 }
}

where the '5' and '6' are identical to their analogous string numbers 
(i.e. they are encircled)

In the Feta Font, these don't seem to by music-glyphs. Is there a 
reasonably easy way to call these within a \markup? are they glyphs from 
another font?

Thanks,

Dave