Isn't that what we do anyway? If i'm in the middle of our own brief, I'll quite happily get the crew to make their way to the bus and we see them there. If I need to get a different bus to the aircraft, so be it. Have done it twice before when reporting for 0700 departures following a day off.
Complying with an unofficial timeline to assist the Company achieve an on time departure will not be accepted as a mitigating factor when you end up on a closed taxiway or take off on the wrong runway.
GO WHEN YOU'RE READY!
Harry