Team setups: Jedi revan, bastila and padme?

It's possible, especially on offense.

Bastila is much less important for fighting JKR mirrors than against other matchups, particularly since either they'll have a Bastila you can steal buffs from, or they won't and neither side will have the Bastila buffs. And GK is mainly important on defense, not offense, with respect to a JKR team.

Either lineup should work fine.

Just run as close to the main line up as you can. You'll lose GK, but he isn't that important, and can subbed out.

The most viable non GR replacements off the top of my head are
Hoda - grand master's training and another level of healing (can grant enemy GMY stealth, which can be annoying, but not fatal)
Ezra - less dps than Revan/GMY, but more than any tank
Juhani - worse possible tank in terms of taunting and buffing the team, but probably the most survivable and hardest hitting
Old Ben - pretty much only good for Mind Trick (which is a benifit to the team even if resisted) and defense up, but it's not like this last slot is too important anyways. Plus you get a heal if he dies.

I use Old Ben because I never geared GK. I think Ben's only g10 or so, but that means an easy death and more likely to heal. Worst I've done against other JKR is the occasional timeout if I'm outmodded and the AI makes a smart play or two