Let's say Hypothetically, the Infinity Gems were transported to the DC universe, and still worked just as well, who are some characters outside of the trinity (and some non justice leaguers) that could feasibly be a part of the Infinity watch? And why?

Waverider kinda feels like a time-travel knockoff of Adam Warlock anyway, so he's a good option.

I'd say Kyle Rayner should have all of them.
He's held great power before and used it responsibly
(except that time when he tried to resurrect his dead Mom).

I wonder how Batman would handle having the Infinity Gauntlet ???