[racket] bib file foreign letters conversion

i have a .bib file with stuff like this that needs to be converted:
 
W{\"o}lfle -> Wölfle
L{\'o}pez -> López

i was thinking of creating a hash for doing so, but thought i'd ask to
see if racket already has something that would work on .bib files.

i see there are some bib tools in scriblib/autobib, but don't see these
as being able to serve my present purpose.

-- 
in friendship,
prad