If it's too much it's too much, but based on all you've said here I'd still recommend Dermablend. That is what it's called. It just seems like if you're not going to do anything to help the itching and subsequent scratching because you like it, then your best bet is to just try and cover it up. I used Dermablend for a while on non-drug related scars for the same reason; they drew too much attention during job interviews and other important events when I was wearing clothes that allowed them to be visible. If you're not planning on using it every day then a bottle will last a long time and isn't ridiculously overpriced or anything. TBF if you can afford a heroin habit you can afford that, if it's worth it to you. It's really not the same as some drug-store stuff, and since it's meant to cover tattoos as well, it covers scars pretty easily. I dunno. That's what I would do (and have done). Not like I have some personal investment in the company or anything so I don't really care, I can just tell you from experience that if you're going to try covering them up with make-up, that's probably the most effective option.
It's not the right option for everyone, but it works well if you run out of others.