You could 1/3 Sorcery points, I guess, starting with 1 at level 1 to 6 at level 18. Give a couple of metamagics instead of the EK features. Plus something that points a little to dragon or wild magic origin. Or another origin, as that's something 5E needs more of!
EG Draconic Sorcerous Knight
Level:
3. Spellcasting, Sorcerer based, make a new list to fit what you feel right. 1 Sorcery point (no flexible spellcasting) and 1 metamagic (1 more at 11 and 19). Choose your ancestry, but no effect yet.
6. Elemental Affinity
14. Dragon Wings
18. Improved War Magic
Completely off the top of my head!