Hehehe, hows about we compromise?
Make it a dedicated icon to represent X no of kills. That way it might just be large enough for folks to see it, and it can be located at different locations on different airframes.
And let it reset when the player experiences a death or crash? Would give people some more added incentive to not go all suicidal all the time and actually try to live long enough to show off a Gold Star or Some other stuff like that.
For e.g.
Kills 1-10 = No icon displayed
Kills 10-20 = you get a big J (for Jack?

) visible
Kills 20-30 = you're upgraded to a Q

Kills 30-40 = Now you're a K-ing

Kills 40+ = You're an ace and have a Big Spade displayed?

Just my $0.02
