Currently there is no way to change IC2 recipes in the 1.7.10 version of the mod, there is no other mod that can do so either. This really puts a huge damper on the progression of my pack. I'd really really appreciate it.

No, it doesn't?
What recipes are we talking about?
Regular crafting recipes work as intended.

Have you tried CraftTweaker?

Have you tried CraftTweaker?

Yes, IC2Classic uses a custom recipe system that CraftTweaker doesn’t support.

Please, refer to this page for machine recipes:
https://docs.blamejared.com/MineTweaker/en/mods/ic2_support/

And this page for regular recipes:
https://docs.blamejared.com/MineTweaker/en/tutorials/1.7.x/basic_recipes.md

Make sure your script file is located at <mc_folder>/scripts/ and your file has the .zs extension.

To check the script if it works, perform a /mt reload call while in game.

This is how it should look:

import mods.ic2.Compressor;

// regular recipe removal
recipes.remove(<IC2:blockGenerator:1>);

// machine recipe 
Compressor.addRecipe(<minecraft:planks>, <minecraft:stick>);