I feel like more than 90% of the adult game fans on Steam are extremely familiar with this practice and would welcome the game with open arms. I don't know how necessary going through a publisher is for you, but offsite patches are hosted on sites like Kagura Games/Saikey Studios/etc regularly as long as you'd be willing to host the game there as well. Regardless, Steam reviewers will always find a way to nudge people in the right direction (since it's actually against Steam's rules to direct people to off-platform patches)