Hi,
Is there a watchlist or some way to have photometric and / or spectroscopic redshifts either from panstarrs or LS?
The Sherlock association has attributes z and photoZ when these are available. I made a filter for you that finds nonzero values of these, you can duplicate it and edit it for yourself.
https://lasair-ztf.lsst.ac.uk/filters/1667/