I definately agree with you on the hold off for evil kryptonians bit, in that case id love for wraith, mongul, gog, helspont, maxima, bloodsport, lobo, braniac, singularity jiane and starbreaker with maybe the coronavores to make an appearance.
While I agree Imperiex is somewhat of a plot device, that is kind of the reason why i want him to appear in the show. As opposed to guys like darkseid or lex luthor, Imperiex is not out to destroy the universe because of ideology that he wants to project or for maliscious reasons. This is rather a godlike entity that is out to do a job appointed to him by a legitimate higher power, no different than your regular neighbourhood exterminator. Thus, not only is he a physical challenge for superman, but also brings forth some moral and enthnical challenges aswell that will force superman to question himself. Afterall, Imperiex only destroyed universes to correct legitimate flaw's in the universes design. If god chose to wipe out mankind, what right do we have to question or go against his wishes, his a god afterall, we are beneath him. But then again, does being a god give entity's like Imperiex the right to so easily just choose to throw away countless lives just like that as if they mean nothing. Is there not another way to fix a problem, and whose to say the universe won't fix the problem itself overtime, it will struggle, but it will survive and continue to exist, basically supes final speech to imperiex at the end of the events of our worlds at war.
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Finally, id like CW to atleast try to not nerf and incorporate powerful entities for superman, Cythonna is underated and as a legit god opens a window to explore the descendant of rao aspect for Superman. Another reason I want Imperiex, is because it opens a window for cw to explore the godly cosmic side of dc and superman's mythos. Id also love for both Kismet and Dominus to appear.
What do you think?