You might try fighter 1/abjurer wizard X -- the abjurer's Projecting Ward shields allies in a way similar to aegis. You can use mage armor and shield to have a really great AC without heavy armor.
Unfortunately, 5E doesn't usually allow substituting ability scores, for the most part. So unless you want to have a high Dex, you are going to have to go homebrew for that. If I were the DM, I'd be really hesitant to allow that, especially for AC. I might be willing to allow an Int-based Sword-based variant of shillelagh at the cost of a feat, since it's not much more powerful than other wizard cantrips. But Int instead of Dex for AC is a tough sell, since a fighter/wizard would otherwise need bulky heavy armor (and Str to wear it) to get a decent AC. So my recommendation is to just have a high Dex plus a high Int.
I'm also not sure how to do at-will damage reflection in 5E. At higher levels you've got fire shield, and I might be willing to allow a homebrew hellish rebuke. However, you could also take more levels of fighter and eventually become a battlemaster with the Riposte maneuver.
I once made an adept class that is based, in part, on the swordmage. But it's 100% homebrew, and really reflects my own opinions about fighter/mages, not necessarily that of the broader community.
Unfortunately, 5E doesn't usually allow substituting ability scores, for the most part. So unless you want to have a high Dex, you are going to have to go homebrew for that. If I were the DM, I'd be really hesitant to allow that, especially for AC. I might be willing to allow an Int-based Sword-based variant of shillelagh at the cost of a feat, since it's not much more powerful than other wizard cantrips. But Int instead of Dex for AC is a tough sell, since a fighter/wizard would otherwise need bulky heavy armor (and Str to wear it) to get a decent AC. So my recommendation is to just have a high Dex plus a high Int.
I'm also not sure how to do at-will damage reflection in 5E. At higher levels you've got fire shield, and I might be willing to allow a homebrew hellish rebuke. However, you could also take more levels of fighter and eventually become a battlemaster with the Riposte maneuver.
I once made an adept class that is based, in part, on the swordmage. But it's 100% homebrew, and really reflects my own opinions about fighter/mages, not necessarily that of the broader community.