I think the most stupid thing with how they introduced Alexander what that they killed K’Ehleyr.
Just have her go missions for long periods of time instead, that are either dangerous or uncomfortable, so Worf have to care for his son. That way she can pop out and take back Alexander whenever.
He isn’t around? Oh he’s with his mom for two months now. Oh they want an Alexander storyline? Yeah he’s here for 3 weeks while K’Ehleyr goes to make peace between the Zc and the Ughoblanches.
That way Worf didn’t suddenly get tired of being a dad and sent Alexander back to Earth when the writers didn’t know what to do with Alexander anymore. He just went back to living with his mom most of the time and Worf sees him off screen.
When Worf transfers to Ds9 Alexander could also live with him there for extended periods of time or just show up now and then. And we could get K’Ehleyr as a guest star!
She and Jadzia would have been an unstoppable force if they teamed up in everyone of Worf’s Klingon adventures.