Welcome to SRP :<0)
""Should the Shapton prove unnecessary, it may eventually wind up in the classies.""

I wouldn't say unnecessary but it may be awhile before you feel the difference if you are new to all of this. I spent my first year with a 1k 4/8k set up and learned to get great shaves off those before moving up to a 12k. You have more than enough to do what you need to do. If you want to get fanatical about it you could get pastes and nano cloth with diamond spray.

Learning the 1k will make or break you.