17 round mags are pretty widely available, so Limited minor is another option. I used a comp-tac holster and pouches when I shot my BHP in IDPA/USPSA. If he's not tied to the BHP, it may be better to trade it for an M&P or Glock and shoot production. If he gets serious about USPSA, he'll buy something else eventually anyway.
Does he have trouble racking the slide with the hammer back, or only with it down? If it's with the hammer down, most of the force is to overcome the BHP's rather heavy mainspring. Cocking the hammer first makes the slide much easier to rack. Does the gun have a magazine disconnect? Those are a annoying at unload and show clear.