MAMP Pro does use nice domains. In order to be able to use Local and MAMP concurrently, I set it to add those crazy MAMP port numbers, and it’s almost as good as Local (and it’s even a teeny tiny bit faster).
The way they do it for the SSL certs is that the OS asks exactly once, when one starts using MAMP, with a system prompt. After that, blissful silence. Not having to type my system password all the time and wishing that Local at least used Touch ID every time is really nice 