Why not just only apply updates when you feel like rebooting?
That's what I do. I've lived without them my whole life,
a few more days won't hurt anything.

Of course, I also turn off the annoying packagekit app that
is like an animated paperclip tapping on my screen saying:

"Hey! There's updates! Don't you want to apply updates!
Com'on, it will be fun! Let's go update the system! You
don't have anything better to do".