Russian Lit. FTW!
Given that I can get Assistant to trigger on my phone by saying "OK Gogol" as well as "Oh, say Gogol",
I'm not buying the official explanations for not being able customize it. If I can use one russian author, I should be able to use any. Given the option, I'd go with Chekov, because his hair was awesomely Beatle-bad in early Season 2 of ST:TOS.