The H8000's S/PDIF output will run at its main sample rate, regardless of SRC setting. In your setup, this will be that determined by the RME.
This means that the Lexicon will have to lock to the 88.2k signal – you will have to ask them if it can do this while running at 44.1 (probably not).
Interestingly, you can often plug a 44.1 into an 88.2, and get away with it. Wouldn't want to do it for the final master, though.
