I would like author posts on my block to end up on the Steem blockchain to be voted on, but I don't want the blog posts to be on Steemit or busy, just my blog location.

It's technically not possible.

[...] could wise team set it up so we can choose if author posts will go to blockchain or not?

It is ;) Right now Engrave for Teams have the possibility to add "Static pages" which are not added to Steem blockchain. It could be extended to standard articles as well.