finding first page of score in scheme

[Graham Percival]

I'd like to display something in the footer of the first (and last) 
pages of each score in a book.  From  ly/title-init.ly  I see the 
first-page and last-page functions:

#(define (first-page layout props arg)
 (if (= (chain-assoc-get 'page:page-number props -1)
        (ly:output-def-lookup layout 'first-page-number))   
(interpret-markup layout props arg)
  empty-stencil))

#(define (last-page layout props arg)
 (if (chain-assoc-get 'page:last? props #f)
  (interpret-markup layout props arg)
  empty-stencil))

... but they seem to rely on special layout properties 
('first-page-number and 'page:last? ), which I assume are calculated for 
the entire \book (instead of for each individual \score).  How could I 
create scheme functions which tell me if I'm on the first/last page of a 
score?

My current thought is to create a function (called at the beginning of 
each score) that records the page number into some global variable(s), 
and then create a "first-page-score" function which checks to see if the 
current page number is equal to one of those numbers.  This seems like a 
ugly hack, though.  Can anybody see a nice solution?

Cheers,
- Graham