FullWings
There is a theory of leadership, that in the absence of a leader, one will come forth.
If I was in my home little airport(back when), I wouldn't hesitate to say something like:
Yankton traffic, Cherokee 1234 10 south at 2000', planning straight in to the runway in use (36) does anyone object? Is there anyone in the pattern? HELLO?
And if someone objected, we , repeat WE, would work it out.
Someone might just say: HEY FRED, listen we got five on the downwind and ten waiting for takeoff how about entering on the 45 to left traffic instead?
AND if you can't come up with the right aeronautical phrase, just say it in plain (plane?) english...its your language you know!