What makes you think the company that makes the best AR wouldn't put ads in it. The top 3 in the field Microsoft, Facebook, and Google to some extent, would never let you disable ads let alone override them with something you wish.
If they try to interfere with that, I will try every route I can to ensure my personal freedom.
For phones you can do most of what you want with LineageOS and Xposed; for AR headsets I'm sure something similar can be done and it's just a matter of time before hackers get together and make freedom a reality.
https://www.wired.com/story/google-chrome-ad-blockers-extens...
On desktop, yes (not for much longer). But not on Android.