Minimize CSS of admin bar / toolbar in code

Hello,
I have a request on the toolbar / admin bar CSS.

I looked through my code today and I noticed that there is a big part of CSS for the front-end admin bar. I am not fond of that lump of code.

Though there are numerous plugins to remove the admin bar, I have no means to do that. I run several network sites and in the backend, I need it. Also I have no means to copy the functions.php to my own theme or make changes in the functions.php at all just to disable it in a dirty way. These are big sites I’m working on, I can’t do with quirky patches. I bet nobody likes quirky patches anyway.

So I’m asking if the bulk of CSS code meant for the admin bar, can be minimized to a separate CSS file that is called for. I know this won’t improve site speed at all, but it just makes the output prettier.

Thanks on beforehand!