What's that?
An item in XGTE that lets a weapon act as a casting focus.
Had a think about it & told my players: "I'm going to house rule that Eldritch Knights can Attune to a +1 or better bonded magic weapon to use it as their spellcasting focus, as per the Ruby of the War Mage - making the Somatic gesture with weapon in hand - otherwise they have to mess around with components to cast, and basically can never use weapon & shield combo as no hand free for casting."
I bet the EK player will be surprised he can't already cast for free with weapon & shield in hand, but requiring an attunement slot seems like a reasonable compromise and averts the silly drop-weapon-cast-resummon thing that the RAW requires.