I've explained that unless you are joined at the hip, anybody who sees you not with your husband wearing an engagement ring, who knows nothing about you will assume that you are adhering to the patriarchal tradition of male ownership of the woman by wearing such an item.
By wearing your ring, you are, like it or not, adhering to a patriarchal custom.
It does not matter if your dh wears one, you are not physically together and nobody has a fecking clue why he's wearing it as it is simply not usual for a man to wear one.
If I saw your dh wearing his 'engagement' ring it wouldn't register at all that it was symbolic of anything. I may think oh that guy's wearing a ring.
You, on the other hand, I would assume were a traditional woman who had no issues with patriarchal customs such as women wearing engagement rings.
And as you are so keen on doing away with patriarchal traditions, I'd assume you would not wear one in the first place.
Women who separate/divorce , in my experience, almost immediately do not wear their rings any more.
They may take a few months to get rid of the 'Mrs' title, if at all.