The only clutch-based locker I'm aware of is the ECTED which not many experienced Jeepers or builders recommend. Being clutch-based, it is known to slip on tough obstacles. Not to mention its clutch pack WILL eventually wear out and need to be replaced which can only be done at the factory.
You're much better off with a standard, not a clutch-based, locker.
And with your 2.5L engine, your rear axle is a Dana 35c which is not strong enough for a locker. Due to that fact, you should install your first locker into the front Dana 30 axle. NO, you will have no steering problems with a front-mounted locker when you're in 2wd. A front locker only engages hard enough to notice when you're in 4x4. So on the street, a front locker like an Aussie, Lockright, or No-Slip, does not affect the steering at all.
P.S. I'm pretty close to SD so if you need to talk with someone, PM me.