Eldritch Knight should be the quintessential spellsword class, with an emphasis on the 'Sword' over 'Spell'. Eldritch Knights are a Fighter who can cast some spells - in contrast to a Pact of the Blade Warlock who is a caster who can use a sword.

The level 7 subclass feature, War Magic, fails at both being particularly useful and at properly placing the correct emphasis on the skills of the class. It requires that EK first use a cantrip, and then they can use their extra attack at the cost of a bonus action. Cantrips, with the possible exception of the SCAG blade cantrips and Eldritch Blast, are explicitly intended to be worse than a weapon attack from a skilled martial character. Why would a martial character want to give up one (or two, for level 11+ EK) weapon attacks for a weaker cantrip?

With this mod installed, War Magic is adjusted to behave in the following way;

War Magic - You have honed your body and magic for war. After you hit a target with a weapon attack, your next Cantrip this turn will be cast using a bonus action.

This rewards the EK for successful attacks with the ability to spend their Bonus Action on a Cantrip and, imho, allows EK to be competitive with Battlemaster in terms of scaling among Fighter subclasses. 

Yes, this works with modded Cantrips, such as SCAG Cantrips and (untested) 5e Spells.
Yes, this can trigger multiple times each turn, if you can get additional bonus actions.
Yes, this works correctly in Honor Mode.

This mod should be loaded after any other mod which affects War Magic, but should be compatible with most other EK edits.

- My Mods - 
Sword Saint's Armory - Make Kensei great again, allow monks to get unarmed bonuses from items while using weapons.
Dangerous War Magic - Better War Magic for a more civilized age.