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In short your imagination only sounds good because it doesn't require you to deal with the realities, rules and requirements.
Work on regaining control of your activision account. That's your best option, even if it's not what you want to do.
Also in most cases you would lose access to any games where your Steam account was linked to, so any third-party won't simply do that because you are a stranger having lost access to the third-party account.
Anyone could claim account ownership without viable proof.
In short, get your third-party account back and you won't have to unlink your Steam account.