Another mod compatibility thing;

When BOP food is eaten you do:
player.getFoodStats().addStats(2, 0.5F);

Rather than the vanilla method:
par3EntityPlayer.getFoodStats().addStats(this);

It uses the getHealAmount and getSaturationModifier methods of the food's class to determine the values. So, you can still return unique value for each food in those methods.

I need this for compatibility with Hunger Overhaul, there's not much I can do on my end unfortunately, as it relies on mod's that add food following the vanilla standard.

That won't work since those methods don't provide us with a way of knowing what metadata the food has. This is the reason why we don't do it the vanilla way too.

Closing this as it is not possible due to the aforementioned issue.