To answer your first question:
7d8 = 7 x 4.5 = 31.5, 7d6 = 7 x 3.5 = 24.5, and 2d20 = 2 x 11.5 = 21.
Total those up, you get 77 at 0 spell power, and at 800 spell power you multiply by 9 to get 693.
If you instead go 9d8 from AA and 5d6 from Wizard, follow the same numbers, you end up at 711. More if you can pull more out of Wizard. BUT
To answer the second part of your question:
In theory, yes. And this is the first place my brain went.
Then I sat down and thought about it for a bit.
In practice, unlocking AA from Elf requires at minimum, 14 Action Points.
Tier 5 AA then requires 32 points (30 points for tier 5, 2 points for +2d8 dice. And that's assuming you dont also want all the other good Tier 5 Archery, which if you've spent this many points, you should probably consider.)
Core 6 EK to get the +1d6 and the 4d6 on and off is 41 points.
So to get everything you want, you need 87 points minimum. 8 more if you want to soak up all the Tier 5 AA stuff, but lets not even worry about that right now.
If you're well on your way into Racial Lives, this might mean nothing to you, but Im sure as heck not, so sadly this is a build I'll have to just longingly imagine personally. If you do want all the AA Goodness, its 15 points out, which means even someone finished their lives, and also has a tome of +1, is still 3 points short.
So one day? Maybe. But not right now at least.