chord naming question

[James E. Bailey]

I'm going to be engraving some more music with chords, and thanks to  
last time, I have appropriate templates that will work. But, one  
problem that is inconsistent is the placement of the flat symbol.

I have to use a modified semi-german chord naming method because the  
person I'm engraving for likes Bb (with the flat symbol), and H for B  
natural. I notice that in my modified chord init template, with \set  
chordRootNamer = #(chord-name->german-markup #f) I get that, but the  
flat symbol is engraved as a superscript,  and the default has Bb  
with the flat symbol inline with the B. I would gladly modify it  
myself, but I don't really know where to look for how that's  
configured. Can someone point me in the right direction?