I like this idea if you want to use the Cambridge, but the linked product is actually two different cables: one HDMI cable and one Optical cable.
You would need one of these for the extraction of an audio signal from the HDMI:
https://www.amazon.com/DotStone-Extractor-Splitter-Optical-Converter/dp/B01KYURMEW/ref=sr_1_11?ie=UTF8&qid=1495383982&sr=8-11&keywords=hdmi+to+optical+audio
However, the Denon seems the best option. It has the power to drive the 220's hard. Wharfdale recommends a max of 100Watts.
It looks like you could get a pretty good idea of how well Denon can drive the 220's by seeing how well it drives the Dentons. Both are 86dB sensitivity with a max recommended power of 100Watts. The 220's are a nominal 8 ohm with a low of 4.1 Ohms and the Dentons are a nominal 6 Ohms, with no low specified (but this review indicates it is essentially a 4 Ohm speaker below 500Hz!):
http://www.hi-fiworld.co.uk/index.php/loudspeakers/65-reviews/519--wharfedale-denton-80th-anniversay-edition.html?start=3
So if you set the Dentons to a full-range 2.0 configuration, I'd consider it reasonable to believe the 220's will obtain similar SPL (probably more) and suspect they will get as loud as you would want to drive them in your room!