I like the way you are thinking, but getting all honorblades in 10 days seems too difficult to me. Getting the blades of Jezrien, Taln, Ishar and Nale in time would likely require them to be in the same position, which might happen, but does not seem likely.
The way of thinking about an immortal champion is nice, it might make for a kind of oathpact 2.0, except that the anti light discovery means time is kind of running out. It is good food for thought at least.