Can Monoblock be split for analog and digital

I'm no expert, but it seems the worst that can happen is you get some ground loop hum. Not saying even that will happen, just its the worst I can imagine. No idea what you mean by parasitic loss, other than yes of course adding a splitter is certainly not going to be an improvement.

Thanks, Parasitic oscillation is variation in output/voltage or current that can result in noise. We shall see...Or Hear..

If I understand you correctly, you're suggesting having the output of two different devices connected together to drive the same amp, with the expectation that only one would be powered on. 

Depending on the circuitry of each device (which I am not familiar with), it's unlikely this would provide the results you are hoping for. Most likely, the unpowered device would at least provide a low-impedance load which would be difficult for the powered device to drive, and it could result in damage to one or the other device. 

I think you are better off adding a passive switch at the input of your amps to switch between two inputs. 

It's really not ideal.  The apparent output impedance of a solid state device when turned off or muted is complicated.

Why don't you try using the SSP in bypass mode??