If it was me, Iíd re-gear and add a locker.
Obviously thatís a chunk of money, and may not be in your budget.
Few things come to mind.
1) id want someone to give that carrier a good going over before installing new gears in it. It could have stress cracks that you canít see with naked eye.
2) Iíve shared my re-gear story before but Iíll give you the short version.
I bought gears and master re-build kits online for a great price, only to find it very difficult to find someone to install them.
Nobody wanted to do the work if they didnít provide the parts.
Quoted reason was due to any possible warranty claim. (Makes Sense)
When I finally found a shop, their price ate up the savings and then some.
If you canít do the job yourself, unless you already have a plan, I recommend that you let the install shop also sell you the gears.
My motto is, any breakage is a perfect opportunity for upgrades.
Best o Luck.