Does every single incarnation of a hero/villian have to go through Smallville? It's bad enough Lex is living in Kansas. Not to mention Metropolis, Kansas! I guess Bruce Wayne came from Gotham City, Nebraska!
If anything, stick to the younger heroes, like a Kyle or Wally. Now that would be cool. Not guest roles, just cameos. But more than Diana's newspaper article.
Why would Adam/Bruce wanna stay in Smallville for hick Lana? That's a pretty weak hook if you ask me. Bruce is all about being the ultimate in accomplishing his goal of justice and absolution. If Adam is Bruce, he wouldn't stay up there in the Talon just to get in Lang's pants... he has to have ulterior motives.