Adding the Bitcoin symbol to the keyboard will scream "ADOPTION". The question is where to put the key? I would suggest they replace the $ with the bitcoin symbol... just kidding. However, it gotta go somewhere, what do you think?
Like what
@jackg mentioned, the symbol of BTC will most likely be adopted as an "emoji" in the keyboard depending on the operating system. I also doubt that by putting and implementing it on the keyboard that it will scream 'adoption' as you speak.
Though adding such into a keyboard will imply that technologies and businesses have adopted BTC into their system, this attempt will be futile especially that such businesses will put them at jeopardy if the country that they plan on adopting it fails to recognize cryptocurrencies as a whole. Such experience will only defeat its purpose, thereby losing resources to them.