[Bendicott]

The summoning test is vs force, not force x 2. For resisting summoning drain, this would put me at :
(16 [attributes] + 7 [focus] + 2 [initiate level]) / 3 vs (14 / 3) * 2
So my ~8.3 vs ~8.7, maybe take a point or two.

Resist binding drain :
(Same 25 + 7 [edge]) / 3 = 10.7 + (10.7 / 6 [exploding sixes]), and so on... looking at about 13.
Spirit gets (28 / 3) * 2 = 18.7, another ~6 damage.

Obviously these are average, and I shouldn't depend on the dice cooperating, but with a few other preparations it wouldn't be so bad. A triggered heal after the summoning to reset my damage, plus boosted will and charisma, as you suggest, give excellent odds.

Good enough that I'd chance it? Probably not. I'm thinking of dropping to a force 10, as I could feasibly bind one in about 3-4 months. But it is possible, without relying on burning edge to survive.

If the spirit were unwilling and using its own edge to oppose me, it would definitely be a different scenario. I've failed to mention that I've had previous GM-sanctioned contact with the spirit, and the alliance is a mutual goal. I should expect no bonuses to my summoning and binding rolls, but neither will they be actively attempting to kill me.

[Reaver]

Page 300 under "step 3: RESIST DRAIN": '.... The Drain Value is equal to TWICE the hits (not NET hits) on the Spirit's defense test, with a minimum value of 2. If the spirit's Force is greater then your Magic Rating, the Drain is Physical: otherwise it's Stun'

Page 300 under "Binding": '....the test is an opposed Summoning + Magic [Force] Vs Spirit's Force x 2, and it inflicts Drain equal to TWICE the hits (not net hits!) On the Spirit's defense test, minimum 2.

●●●●

So to review:
After you summon, you resist TWICE the hits the spirit rolled on its summoning defense test. (And as a defense test, Edge can be used at GM descression)... meaning up to 28 drain (P or S), before edge!

THEN,

Resist up to 56 Drain (P or S) binding it!

The only way to ensure drain is Stun damage is to have a Magic Rating equal to its force, otherwise all that damage above is Physical.

So as you can see, there is more for you to consider....

On an other note, you're not the first person to comr here with this EXACT idea..... It's never ended well for all the others that thought along your lines.....

GMs are evil bastards.

[Bendicott]

So to review:
After you summon, you resist TWICE the hits the spirit rolled on its summoning defense test.

Yes, I know the math. Doubling the hits is accounted for in my post above. And yes, it *could* roll 28 hits and make me resist 56 points of drain, at which point I would roll up a new character. You can't assume the GM is going to have god rolls, or you'll never get anything done. Take precautions to balance things in your favour by an acceptable margin, then start rolling.