It would be especially neat if any parameter that was assigned to receive a particular CC also transmitted that CC. That's how Nords (and most keyboards) work. A global option for Receive MIDI CC, Send MIDI CC, and Send/Receive MIDI CC.
I wonder if you could use a MIDI block to tap tempo instead, and somewhere in the MIDI chain loop back to the FX8 so that it also received its own CC message.
Other than that I'd mention it has been established that Fractal products seemingly aren't meant to be the tap / MIDI clock brain of your studio or live setup, since they don't transmit MIDI clock sync.