Here is the thread in which user naugastyle describes his experience with C41 and split BLIX. Yes, it was C41, not E6 as I incorrectly wrote before. The reason why I wouldn't split a BLIX is that a bleach needs a halogenide salt to form silver halogenide which then gets dissolved in the fixer bath, whereas a BLIX forms soluble silver complex right away. Therefore I would expect insufficient bleaching with your split bath. You can use tests for retained silver like selenium toner to test this.

I am very surprised that processing at +2C causes such a disastrous result, since Tetenal's instructions even provide super fast processing times for yet higher temperatures. The contrast will be higher and the colors will be off, since you don't follow the kit instructions that way, but it's interesting to know that the result from this turns out completely unusable.