edit reverse geo result after lookup?

i'm using opencage for reverse-geo lookups with OTR_PRECISION=5. my problem is that opencage returns a deceivingly precise address, while i was hoping it would simply return the city or district. is it possible to edit the returned data before it is stored?

is it possible to call the default revgeo function in the otr_revgeo hook, to wrap it in my own function?