ADHD

You will still need to mask a lot unfortunately. Please understand that your relationship with your employer is contradictory on a fundamental level. They want to extract the most labor from you for the lowest cost and you want to maximize the price of your time for the company while minimizing the amount of power you have to put into doing a given job. I want to emphasize that I don't mean this in an "as lazily as possible" way, but in an "as efficient as possible" way. Mental energy is a resource and of course you want to manage it responsibly. People generally are willing to spend an extra amount at work every now and again because they want to do a good job, but not constantly.

Now a neurotypical person doesn't need to put in so much effort to do the same job, putting you at a competitive disadvantage. Which is why those protections exist, but at the end of the day the company doesn't care. The individuals at a company might, don't get me wrong, but overall the system is putting pressure on the managers to get the most amount of labor from their underlings for the least amount of resources. Plus your manager has the same contradiction with the company, they want to minimize the effort while maintaining an adequate quality of work. They most likely are also willing to expend more energy than they normally expect to spend at their work, in order to get you what you need, just because they're a nice person and helping others is a nice thing to do, but they also don't want to do this constantly and how much they're willing to spend is at their discretion.

All to say that you probably will have to pick your battles. If you need a specific accommodation that very clearly is necessary for someone with ADHD‌ (so obvious even a neurotypical can see it) or something that is already accepted common practice then they will likely approve it with no problems because they know about those protections. If they hire a paraplegic person they understand they need to make the workplace wheelchair accessible. Like, obviously.

But if you ask for something more unorthodox (and I'd argue your autohotkey script falls under that category) and it's not a big deal the managers might give it just because they want you to have it. I mean they are people to, they want to be nice and helpful (generally speaking) just because it's nice to be nice. But they are neurotypicals. They do not understand that you might need need whatever it is you're asking for but they think of it more as something to aid you because of "your condition". So if you ask for things that they don't think are appropriate or if you keep asking for a lot of accommodations then they might be less inclined to help you and just default to "well they are going to have to spend more of their energy because I don't want to spend more of mine (anymore)".

So what to do when you're denied? You can drop it entirely (giving the impression it actually wasn't necessary after all), drop it and raise it every now and again whenever you feel like you have earned some good-will, look for alternatives or try to bolster your case on why you need it and how it relates to your ADHD in a provable manner. You will want to talk to a lawyer before going that route though, lawyers can give you advice not just on how to fight a lawsuit but on what kind of documentation is generally accepted or how to best present your case to your workplace. You will need to be diplomatic though, you need to convey that you need this, that you believe you are entitled to this but at the same time you probably don't want to openly threaten them with the law and that you will make life difficult for them because you still have to work with them. However you also need to be resolute enough that they don't think you are a pushover. It's really fucking hard, I explored this option once (not relative to my AuDHD but something else worker-rights related) and decided to not pursue it because I was quitting soon anyway and had too much other stuff on my plate.

Tl;dr: Just because the law demanding equality exists doesn't mean you automatically have equality. You still have to balance how much you need something with how accomodating your workplace is and how much you're willing to fight for it (and deal with the side-effects of having fought them).