[ Answers ]

1. The alternative to ctypes.c_wchar_p string is to use ctypes.c_char bytes-string. The downside is you need to .decode() and .encode() each time you access the value.

2. Use multiprocessing.Array('c', b'bytes-string') to replace Value() for string shared memory. Using Value() will raise in an exception "bytes is too long"

[ Summary ]

As summary for future self:

1. Use multiprocessing.Array() for shared string
2. Use multiprocessing.Value() for shared int
3. Use multiprocessing.shared_memory.ShareableList() for shared list
4. Use multiprocessing.Manager() for shared memory as Proxy, unrecommended because it's slow.