Linux veracrypt hidden OS alternitve?

Been down that path myself, back when it was still TrueCrypt. If I recall correctly, you have to supply both passwords when accessing the outer volume to protect the hidden volume from corruption which makes it easy to leave unintended traces. And I’m sure you’re familiar with rubber hose decryption Not sure if it meets your needs but I find a LUKS partition with a detached header pretty indistinguishable from random data and plausibly deniable.