| but I only seem to find Brushed motor ESCs that are reversible with | respect to changing wires physically.
There are plenty of brushed ESCs out there that can do reverse. They're generally found on cars and boats rather than planes, but they're out there, and should work fine for your application if you used brushed motors.
| I assume when I see a picture of a bi-directional ESC with two wires | going to the motor that this would be a brushed motor setup.
A good assumption. Generally, two wires = brushed. Three wires = brushless (and sensorless). Three wires + 5 more little wires = brushless with sensors.
| Can anyone help guide me in the right direction in finding a | bi-directional ESC for a Brushless motor?
For brushless motors, I know of no reversable ESCs. The best place to look would probably be somewhere that caters to R/C cars, but brushless motors aren't big with R/C cars yet (as they're generally prohibited by the racing rules.)
Generally a brushless setup (sensorless, which most are now) can be reversed by simply reversing any two of the three motor wires. If you could wire up a relay or something to reverse two wires for you, you could have reversing that way. Just make sure that your reverser can't only leave only two wires connected -- that's a good way to burn up your ESC. Also I'd make sure that you don't reverse while the motor is running -- that sounds like a recipe for frying something too.
This may be obvious, but most of the airplane props we use aren't very efficient when reversed. But they'll still generate some (back) thrust, so that may be fine.