[Python] Returning default members when Enum member does not exist

I have an Enum where I would like a default member to be returned when a member does not exist inside of it. For example:

class MyEnum(enum.Enum):
A = 12
B = 24
CUSTOM = 1


print(MyEnum.UNKNOWN) # Should print MyEnum.CUSTOM


I know I can use a metaclass like so:

class MyMeta(enum.EnumMeta):
def __getitem__(cls, name):
try:
return super().__getitem__(name)
except KeyError as error:
return cls.CUSTOM

class MyEnum(enum.Enum,metaclass=MyMeta):
...


But that appears to only work if I access the Enum using MyEnum['UNKNOWN']. Is there a way that covers both methods of accessing members of an enum when the member doesn't exist?

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