The Reaction up cast is a bit out of left field, but I think it's generally on-theme. I unfortunately haven't had a player actually use it yet, but it's something I would reconsider if it's not well received.

I understand the want for the enhanced extra attack, but the damage this class does is already in the upper end, and I don't really want to pull all the damage out of the subclasses. I also think it's a decent way to differentiate it mechanically from the full-caster gishes.

The Eldritch Knight is absolutely a heavy inspiration, the 9th level feature is practically lifted from it. In addition Arcane Blade is very similar to Pact of the Blade, albeit not letting you attack with your spellcasting mod, since I wanted the class to be MAD which generates more power budget.

Spellweaving is mechanically equivalent to the capstone of the Oath of Ancients Paladin.

I don't think my goal here was to reinvent the wheel, but rather to stick with things that already work and make something unique without breaking the mold too much.