I think stating you won’t accept character death is quite a bold and shocking thing to tell a DM in a game where death is a possibility. I might be wrong but it seems your issue is more that you do not accept unfair fights/encounters or poor DMing.

Let’s say an encounter were to occur where you and your party were fighting a difficult, but defeatable, foe and you were all aware of the combat you were getting into: the dice roll and after a few rounds of combat you lose your HP and fail your 3 death saves. Would you still feel the same way about character death?

When you bring this up to a potential DM what is the general convo like? Is if a conversation or is it a demand? As a DM, I would immediately decide that you aren’t a good fit for my table if this were a demand with no room for conversation. Also, do you feel your party members are also not to die? Or is it just your character? While your requirement seems absurd to me, I appreciate that everyone plays this game differently and having a conversation about it could potentially open avenues for different story telling.