Careful who you tell that to. While I disagree with the nerfing of a single player class, (if it was a multiplayer thing I would be on board) I'm okay with how it ended up.
Spirit Blade is more strategic and it's easy to charge, so I'm okay with that.
Anyway, I get the feeling that Gathering Storm will be less effective since two-handed basic attacks are slower than a staff basic attack. But Flashpoint may be more effective, since some Leathers grant +Critical Chance and Tidarion has 12 Leather.
But to be honest, the only real benefit I see is using Tidarion with someone who is NOT a Knight Enchanter, since Spirit Blade covers the melee attack aspect, so while it can look cool to be swinging TWO large swords around, it is ultimately redundant.
Of course, there is always the role-playing aspect, so if YOU think it fits your character to be a Knight-Enchanter swinging a two-handed blade with no actual blade, just magic, then you'll make it work.
Case in point, I still keep a Superb Cleansing Rune on my fire staff, even if I've already defeated all the Red Templars and such, simply because I think it looks cool. I would likely get more damage from a Spirit Rune, but it doesn't "match" my character, so I don't use it.
Long story short, your idea may not be "optimized", but if you like it, then do it.