That's why our Bitcointalk Show's handle is @btctalkshow. The original was already taken by this 2014 project. [...]
I have a solution... and I've already managed to get the desired username this way [This is just an example, but I hope it helps] 
In that case if we really want to take "BitcointalkShow" twitter handle then we need to register a same domain name also this will increase the chances of getting the handle
"BitcointalkShow.org" is available and BitcointalkShow.com is taken but still available through GoDaddy Broker Service with little higher price.
