Maybe a diode detector (like an RF probe) between CW-1 pin 1 and TP 20 might work to receive. The selectivity is then defined by the 45 MHz roofing filter, which is 15 kHz wide. You would need to turn off the BFO. It would require a switching circuit for the diode to be able to back to SSB/CW with the crystal filter.
Just speculation on my part.