With the extra room in a ZZ it could be possible. Also a narrow bandpass filter could also be employed after the antenna but before the receiver section.
Ok after looking at my BitChar-A box I noticed it wasn't a 47mhz but a 45mhz. the others were 57mhz, 35mhz, and 27mhz. I beleive those are all the same as the BCG. but I could be wrong.