Comment by onli

I am not aware of a better alternative. It is a good question, that would be quite helpful!

What I did in the past (with M3) is to add some additional design tweaks (in flutter), like giving buttons an elevation. That worked when I had the designer on my side and since the app came from flutters M2 style, which had similar aspects. But it is cumbersome to argue against a google guideline with only usability knowledge and test results, and it also frankly depends on each component what can be done, which means the adapted design can easily become inconsistent if one is not careful.