I have just inserted my old 565z3 between a Sky+HD receiver and an 818v3 to achieve a similar thing.

There are a number of operational issues such as Controller status, delay and synchronising inputs to be solved but it works well and sounds good.

I configured the 565 for a two-channel large digital set-up: Type 3, Layout M, No Surrounds.

Needs some extended listening and tweaking to decide if it is a keeper set-up.

In the spirit of Spinaltap, I would like to confirm that I am not involved in the corrupt theft of a global sport.