IMO I think the Smallville Universe works best if there is none of the other main DC characters (i.e. Batman, Wonder Woman, Green Lantern) involved. That's why I prefer not to think of the Season 11 comics as canon. Only the ten TV seasons. As far as I'm concerned, the "Batman" of the Smallville Universe would be Justin Hartley's Arrow (second-in-command of the Justice League, main financier, etc.). Leaving those other main heroes out would make Smallville unique and very different than the regular DC.