Those don't actually work together. Battle Blessing only works on Paladin spells. Sword of the Arcane order spells are still explicitly wizard spells (not paladin spells from the wizard list.) At least, that's my reading of the feat. Even if they did work together you just gave the paladin some spells that are only about ten levels out of date and made it so that instead of 4 different attributes he needs, he now has 5.
They're still your paladin spells, since they're the spells you prepare in your slots from the paladin class. Just like how a wizard with Arcane Disciple:Healing can cast cure light wounds with his daily 4/4/3 allotment of 'wizard spells'.
Now, I agree that a battle blessing/SotAO paladin still isn't as good as being a pure wizard, but this is 3.5 - that's given. It's still a huge step up. I mean damn, free quicken means that you can act
twice every round. That's huge. And even low-level wizard tricks can invalidate high level challenges. A mindless creature like a mithral golem, for instance, will take any illusion at face value, letting you totally shut them down with Silent Image. (At least, so long as they don't physically interact with the illusion and get a save.) Similarly, fly lets you safely flip off the tarrasque.
Even without putting points into int, many low level spells have no-save effects, and don't care about CL. Try quickened spells like True Strike (guarantee a smite!), Expeditious Retreat, or
Benign Transposition . I'd recommend quickened
Blockade, except it's
already a swift action - and let me tell you, there are very few monsters that can deal enough damage to chew through 600 hp of barricade.
Heck, invisibility is only second level. And you can use your normal full round of actions while turning invisible, which is an incredibly useful trick.
Or buff yourself with spells like mage armor, fist of stone, and enlarge person, without taking ANY time out of smiting your foes.
And I don't even have to explain how quickened Silent Image is all sorts of tactical awesome.