I currently have a pair of second gen fives, but I’m beginning to think that I could replace them for something that’s sounds just as good for a lot less cash.
If you want it to sound a least as good then I would have thought your best bet would be to go with hifi speakers being driven by an amp with a BT dongle – but then you’d have wires to deal with…. not sure if that’s an issue or not for you.
Alternatively you could sell the 5’s (£500 for the pair it seems), get some hifi speakers and drive them with a Sonos Connect:Amp (the later post 2015 version that’s still got at least 3 years before it becomes legacy – and even then it will still work fine) which will cost about £200 used.
You could connect your TV into the connect amp and it would autoswitch between streaming and TV input.
Otherwise, is it even possible to BT stereo to two separate speakers? Dunno.
Personally I think that one of the beauties of Sonos, and similar, speakers is that you can start a stream and then leave the room/house/country and the stream will continue – whereas BT will stop as soon as you move too far away.