Hide upgrade site in admin bar on certain sites without upgrading it.

Is there a way of hiding the upgrade site in the admin bar without actually removing it network wide.

Basically i have a number of sites of my own that members can see the upgrade site in admin bar.

If i upgrade that site it still shows the "my account" button to all users. Obvously i can hide it network wide however i would like to retain this.

Is there a way to remove this button from particular sites only?

Thanks