You can still run an R/C brushless motor and ESC from a DC source. A large capacitor will likely be needed at the ESC power input if using a suitable A/C to D/C power supply.

Do a google search for "servo tester". You will find many circuits that have a potentiometer input, and they then output the proper signal to operate a servo, which is the same signals used to control the ESC.

Good luck,
Craig