If you have source code, then you should modify the things you want and compile it. That is a harder option, but if you know programming then you'll get this right.
Sed and awk are stream text editors which could help you if you choose the first option I've recomended (to download html page with the availability reports you want and then run it through sed or awk). Sed or Awk are linux programs which could be run from terminal and if you want to get familiar with those type:
and you'll get much better explanation what they do.
Those programs (sed or awk) could help you if you save your availability report .html page to some folder of your choice on your Linux server and then run that page through sed or awk to delete the unwanted lines and get the availability report which looks like that I've posted in picture.