I was looking at almost the same situation myself a while back.

I had almost convinced myself to attempt the repair but i am inbetween moves and don't have access to a decent shop at the present time.
Here's some stuff that I found.
The accepted method of adjusting a bent or misaligned crane is to hit it with a hammer. Really. Here is a Brownell's document that describes the process on Ruger and S&W DA revolvers.
http://www.brownells.com/userdocs/learn/Inst-230%20Yoke%20Crane%20Align%20Tool.pdf . The alignement tool that Brownells discusses will probably not work on the 1892, but my understanding of the tool is that it is used to protect the hinge mechanism, not to do the actual adjustment, which is done witha plastic hammer.
Since no tool is available for an M1892 the crane might have to be removed from the revolver to protect the hinge from stress. I think the process would be:
1. remove cylinder (maybe it could be left in place?)
2. remove crane
3. Place crane in a padded vice and "adjust" it by tapping it with a plastic hammer to reposition ( very slight bending) the crane to correct the cylinder positioning.
4. reassemble and check cylinder positioning.
5. repeat until alignment is correct.
Disassembling and reassembling the M1892 crane and cylinder is not hard but it takes a couple minutes. So - a couple minutes taking it apart and placing it in the vice, 2 seconds giving it a tap, and 2 more minutes putting it back together again to check it. and repeat until it's right. The hardest part will be deciding where the appropriate place is to do the hammering. Replacement crane is available here,
http://www.e-gunparts.com/products_new.asp?CatID=9381 in case your crane gets screwed up in the process - which it shouldn't. I don't think it's a big job for a 'smith with experience on DA revolvers. I have seen Wortners mentioned as doing revolver work, but i have no experience with them. Should be a straight forward job for any gunsmith experienced with DA revolvers.