DJing with Sonos: a potential hack AKA solution

So I was interested in getting a connect/amp so I could link the master out of my DJ mixer to my Sonos setup in the living room which consists of a pair of Ones and a Beam. Browsing the community it appears that there is a delay on the Sonos playback which means the sound played back in headphones attached to mixer, whilst cueing and mixing, would be out of sync. For anyone who DJs, not what you want eh. So what we really need to get around this problem is for the headphone output of the mixer, to be delayed by the same amount as the Sonos setup. Now then. After a bit of googling I discovered this (below). Have a look and feedback comments. Essentially, using some phono and jack adapters from any hifi store or similar, I see no reason why you couldn’t insert this device in between the DJ mixer and the headphones. You could then adjust the delay (latency) and hey presto. It’s just an idea so why do you lot think?

LINDY Lip Sync Corrector https://www.amazon.co.uk/dp/B005ZRWWJ0/ref=cm_sw_r_sms_c_api_i_etNpCbDCJAYRE

Unless I missed something, this could be what everyone has been after.