I agree that while it does play into the missile boat role that the gryphon has, Autoforge is boring.
Thinking about various ships that fill the "missile boat" role (the clipper from seeker as a good example of an alternate implementation of autoforge that is more interesting, but still kinda boring imo) and i can't think of a way to implement an ammo replenishment system, like autoforge and have it actually be fun and engaging to use.
Making note that with the new missile skill giving +100% ammo, it's not uncommon to see gryphons not run out of ammo for their large/medium mounts in even some moderately large battles, so you might not even have a reason to get to use Autoforge in a battle!
While vanilla fast missile racks might seem like an idea for a replacement system, it having 3 charges means you'd be able to launch 4 volleys from the frontal large missile mount one after the other. Which would be obscene.
If I was to propose anything, then it'd be this: give the Gryphon a hullmod that grants passive but slow missile regeneration, and replace the system with a version of fast missile racks that doesn't store multiple charges and just has a cooldown.
This would give the Gryphon battlefield sustain, by merit of regenerating ammo, and a shipsystem that is interactive and will see actual use. (if the gryphon was to get passive missile regeneration it would open options up so you could even replace the system with mjets, AAF or some other non-missile focused system)