Other than having handlebars and a hand-lever operated brake; the controls are so different between motors and velos, that setting up a velo with FR brakes for “training” is not much more than a placebo.
IME, throttle and clutch management is what takes most people more time to develop than braking, which is pretty straightforward.
Maybe also being an MTB guy; I always start rear brake first; that carried over to the motos. Starting with the rear, you’re already slowing and setting the suspension before the fronts start, lessening the “dive” that feels like you’re going to OTB.
Brakes aren’t an either/or all-or-nothing proposition ; I’m not sure why that trope persists around here.