Crops can get you almost everything in regrowth. There may be a handful of things that you need bees for, or that are easier to get through bees, but those things are not essential to regrowth, so as far as I'm aware, theycan be ignored.
For what it is worth, you can simplify bee breeding in your head by looking at it this way: Bee breeding is very similar to crop breeding with AgriCraft. Except that there is a change you will get a different result than you want, Just throw those results away and keep trying. (There are mechanics increase the chance you get what you want.)
With AgriCraft, once you have one seed you want, you can just grow more with it, while with bees, you need to secure your ownership of a new specie by creating a stack of drones. But after you've done that it is again the same. (just keep your stock of good drones replenished, so you can keep trying)