Sable

Not in the way you want. A release build compiles Dart ahead of time into a snapshot, and the names go with it. You can get at the runtime structures with the specialist Dart tooling, and people do recover class and method names that way, but nothing hands you back the widget tree. Plan on reading assembly.

759 days on Il2CppDumper reads worse than it is. The metadata format only changes when Unity changes it, so the tool sits still for a year and then somebody posts a patch for the new version. Judging that one on push dates is the wrong instrument.