Analog to Bluetooth conversion

I have some very nice “traditional” loudspeakers that I don’t want to let go of at this point along with a matching subwoofer. (TV, 4KDVD, Satellite, Receiver, LR + Sub) These are being powered  by a Denon receiver. Owing to roof pitches, stringing conventional speaker cable would be a real bugger for ceiling mount surrounds and I’m wondering if there’s some way to cast a Bluetooth signal from the Denon to some Sonos rear surrounds without stringing the speaker cables (read cutting sheet-rock to do it). Is there some means of putting a Bluetooth converter at the AV Processor that can be used with Sonos speakers for rear surrounds. I’m concerned about “timing” issues... Of course as soon as my Vandersteen’s blow up, we’ll be 100% in the Sonos camp (as we are at our place in Montana!) ;-)