I think the making-me-not-immune would involve significantly more unanesthetized surgery if it even works.

I guess that's a reasonable tradeoff to not want to make.

Yeah. Hopefully we'll only have to do this twice at most, anyways.

I really hope she can knock you out.

Same.

I'll email her about it and see when she'd be ready?

Hit me up whenever, I haven't hit headache land yet.

A bit later: 

Karin will be ready tomorrow. She wants an actual operating room but might need to coordinate with you on how fancy the operating room is.

Can do.

How do you want your OR?

Specs! (This is mostly 'please as fucking sterile as you can make it' and 'otherwise low tech but supplied with things like extra Sasuke blood and IV fluids and antibiotics.')

Cam can do very sterile indeed, at least until someone opens the door. He puts it on top of the apartment building.

Oh good. She can sterilize her own skin and the area around Sasuke's eye at least...

Cam attended medical school, right, does he want to help in case something goes bizarrely wrong? Or just in case it turns out Karin can only keep Sasuke unconscious while in contact with him?

Yup, he can attend.

Then they can schedule a surgery.

(Karin does in fact end up needing a spare pair of hands, but mostly to hand her stuff - she's keeping a hand on Sasuke at all times out of an abundance of caution, but can knock him unconscious and then monitor him like that just fine.)

Cam can respond to 'scalpel' with the best of them.

She keeps Sasuke unconscious for monitoring - and so he will definitely be resting - for a little bit even after she declares the implant took, then starts waking him up. (This is delicate with trained shinobi, because trained shinobi do not like being vulnerable on a very instinctual level.)

Of course, he'll need to keep the new eye covered and not be pushing chakra to it for a day, even with her healing it.

And Sasuke wakes up. Slowly. And groggily.

"Good morning sunshine."

"Uuuuuuuggghhhhh."

Still, he reports only some soreness to Karin when prodded. 

"You need anything?"

"My throat's dry."

"Do you feel like you're gonna puke, because it's ice chips if you might puke."

He makes a face.

"I don't think I'll puke."

Then he can have a little cup of water.

He doesn't need telling to sip very slowly at this.

Cam sits with him, watching the various vitals-taking machines.