You can just put the !g at the end you know, also I'm not sure why you are copy/pasting?
Something I just recently noticed: You don’t have to put the bang in front of the search. It can actually be anywhere in there: “!g foo bar”, “foo !g bar”, “foo bar !g” all work.
Saves quite a lot of time.
If there were some way I could just use a hotkey to redo the same search in google, this wouldn't be such a big deal, but having to break up my flow with all the extra copy/pasting or retyping is getting frustrating.