if the bumper dosen't fit width wise then don't try it.
You really can't cut the bumper and re connect it. even if you did there would be an immense amount of bodywork involved that would eventually crack b/c it'* on flexible plastic.
Trust me man i spent 5 months recently as a paint line tech at maaco and was around a ton of body work. not to mention all the cr@p i do to my car.
The cheapest thing to do (if it dosen't fix width wise) is have a bumper custom made.
I'm not saying you can't make it fit, i'm just saying don't think about cutting it in half to change the width.
Also if it is close enough get a good heat gun to bend it to the contors of your car.
Try it out, i'd like to see it.
Hope that helps