Easyest way, to begin with, is to use a browser addon and userscripts. Addons to look for are Greasemonkey, Tampermonkey, or Violentmonkey and alike alternatives. Keyword to google "userscripts". P.S. As I see it, from your description, you just want some mods (changes) to existing UI, no need to rebuild one from a scratch in other more complicated ways.
In this case, I would say – fck Apple. Indians demand is solid. Apples shitty policy of random plugs and industry incompatible chargers shouldn't have been born ever and definetly it shouldn't continue. Usually I'm against regulation by goverment, but in this case it is realy for the benefit of users and enviroment.