Copy Rewrites - Quick and Easy with Ongoing Work

I have some copy that needs rewriting for a different niche and it's associated keywords. I'm looking for someone to rewrite this copy around the new keyword, yet keeping it as close to the original as possible. I have a list of 20 keywords, therefore need 20 seperate rewrites. This is a simple task yet I simply do not have the time to do it. It's an urgent project that needs to be done within 2 days (maximum). If a good job is done, I have another 80 rewrites that need to be completed by next week