you could steer the printhead from homing position stepwise to the position with pronterface (and remember how many steps it took), then you can estimate at which coordinates it is located. Then you can send the command (slow speed, for trying) via the console, for example: "G0 F1000 x=.. y=.. z=.."
(correct me if I'm wrong ;-))
(correct me if I'm wrong ;-))