Id love to try and make a code that makes you 100% invisible, but i really dont see that being possible without the use of Breakpoints. this is because every single enemy in the game pretty much, has a "I found Link" value associated with them. Firstly, this would be super hard to find i would imagine just for one single enemy, but then once you found it, that would only effect that one particular enemy. and even if you found every single enemies "Awareness of link" address, they'd all change as soon as they respawned or you left an area and come back..
but with a breakpoint, you could find the enemies Awareness value, and trace it back to the actual Game Instruction that is responsible for it, and change the instruction in a way that makes it so they never become aware of you. and since Every enemy is really an object of a class, this would effect every enemy in the game. This is how it would have to be done,i dont see how else its possible.
Unless there's something that we could change about Link, but theres no stealth equipment or anything that makes link more than just Silent, so i think theres no other way than what i described before.