engraver for beginning-of-system partcombiner "reminder markups"

[Kieren MacMillan]

Hello all,

Has anyone already tackled the issue of showing, at the beginning of each 
system, which voice(s) are active in a given partcombined staff?

e.g. Say I have Clarinets I & II partcombined into a single staff, and Clarinet 
I is soloing for a number of systems. The partcombiner currently places

    I

above the measure when the solo begins. I would additionally like the 
partcombiner [or some additional engraver] to place

   (I)

just above the first measure in any subsequent system(s) for the remainder of 
the solo.

Thanks for any hints/links in this direction!
Kieren.
________________________________

Kieren MacMillan, composer
‣ website: www.kierenmacmillan.info
‣ email: address@hidden