I want to run with this object-agreement marking thing, so why not create a set of pronouns so that some but not all of the object-agreement markers can phonetically resemble them?
3sg - Fem t'one
In this system, one 3rd person pronoun is specifically marked as feminine and used for feminine animate antecedents, and the other pronoun is unmarked and used for all non-animate-feminine antecedents. Basically as if English "it" and "he" were a single pronoun. These are only the nominative stems, and I'll leave it to someone else to decide how different case forms of the pronouns should be formed - maybe there's an oblique stem? A genitive stem for only that case?
I've already coined -d as a 3rd person singular object marker, so let's fill out the rest of the series: