BWA editing and rebuilding

I would like to do some tests about this.
There is any way to rebuild a bwa for a .bwi image?
I mean, if I have only the image and a bwa that doesn’t fit for sector lenght the image … can I shorten by using a manual tool?
Do you know any software like this?

Thanks.

No idea but what I do know is that if you only have the image and not the original cd/dvd of anything that requires a .bwa file, you are not allowed to burn or otherwise use that image anyway (since there is no open source or other freeware program that uses securom protection).