Or you could remove the UR integration from Cubase, then it would act like any other interface. (sorry no clue what part of the UR installation has to be removed/uninstalled, ask in the UR Forum)
Pull up the faders in the UR mixer and you would hear any signal coming in to it.
But.
IMHO it would be much easier to make a template with all audio inputs routed to audio tracks and have monitoring enabled, put them in a folder if you don’t want to look at them.