well its 4:20 AM here so i may missed the point of this topic !))
but there is a trick to monitor with reverb.the idea is to monitor the input(singer) directly from the soundcard without latency,and monitor only the reverb from cubase with latency but its a reverb so it will be like a pre delay on the reverb.
here is a video on how to route in cubase
just to add to this video,for convenience and practical recording session, of course i would not record on the “reverb monitored” track like in the video( it should be for monitoring the reverb only)
i will create a separate audio track or tracks to record on them