[atwang]

Since your team identification shows FTC, and your team is on the Edison division list, I'll provide an FTC answer assuming that you might actually be asking about FTC and not FRC… If this turns out to be an incorrect assumption, maybe it will help someone else. XD

The three suggestions I can think of:
(1) You could investigate putting the match time on the driver phone. I know it displays on our autonomous, but that's also because it stops the robot after time ends. I don't know how feasible it actually is for tele-op as I didn't program on my team this year (particularly if you don't want the robot to stop 2 minutes exactly after you press the run button on the phone), but it's something you can look into. You have to be able to press the button anyway in case you need to stop the robot in an emergency, so that might work best in terms of visibility (and if the other options don't work out).

(2) You can also stand next to or between the drivers instead of behind, although I've found that the alliance box doesn't seem big enough for that. If you can do that, that might be the simplest solution, but perhaps you've already tried this and it didn't work out.

(3) I couldn't find a rule on this when I searched (if someone else does, please do share), but searching found a 2013 official Q&A that basically said that non-communication devices and things that didn't pose a safety hazard were fine, so I think a stopwatch would be okay. That said, I would try to find an official ruling yourself from this year and/or ask the head referee at worlds just to be sure.

Hope that helps!