I did this a while ago, all it does is starting your OSBot client via proxy, so you don't have to edit batch file everytime you change proxy.
If you have more proxies then put a list, it will pick a random proxy.
Make sure it's in the same location as osbot and osbot's .jar name must be "osbot". Feel free to decompile code and look for potential malcious code if you don't trust me
You can also have proxy.txt file with ip:proxy list, it will load this also.
Download:
https://dl.dropboxusercontent.com/u/26357784/BotProxy.jar