Not able to do on the PLAY:1 and PLAY:3 without additional investment. Least expensive would likely be a Roam that you could AirPlay 2 to, and group on WiFi with the older speakers. Not sure about the cost of the IKEA speakers, I don’t track them. 

Well, AirPlay 2 or Bluetooth….

Thanks, that was what I thought, I’m reluctant to spend more on Sonos speakers so I might buy a NAS and setup a music server.

I did, originally. Found a lot of other uses that weren’t Sonos related for the NAS, then of course I ended up expanding my collection of Sonos devices. Got a Sonos One, AirPlayed to that and grouped the PLAY:1s I had to that….