Well, Summon could really fit with a melee fighter since it does need intelligence to scale. Your summons will get power ups based on your level and the summoner ability.
You do not need Necromancy to have a proper summonings, the blood incarnate acts as a tank, but you don't need Necromancy in order to summon this type of incarnate, you'll only need blood surface, which you'll find everywhere.
As for the Polymorph part, I'd say that it is not mandatory, though the Tentacle slash and Heart of Steel are two very neat spells for a warrior type character.
Concerning the weapon type, it's up to you, warrior type character can go 2x1Hands, 2Hands or 1Hand with a Shield. The three are viable, depends on what you like and on how you build your character.