coax

Hi quick question. I've just ordered a 2012 mac mini for a streamer.  I plan to connect to my rega -dac-r using mini toslink to toslink cable.  The issue is, both optical inputs on dac are currently used (main computer and tv).  I wonder can i use something like this to connect tv to...

Chord Signature Digital Coaxial Interconnect Cable RCA-RCA 1m long. In excellent condition Included original packaging and box. £120.00 including postage to mainland UK Payment by bank transfer please.