From my experience EWD are quite aggressive but I'm no expert
I own two 5 month old EWD's... Every thread about putting different species together discourages it... Also EWD's like high humidity with plenty of water & I would suspect that blueys would like dry low humidity environments...
If you have a large enough enclosure it could work but it depends on the individual lizards. Water dragons do like water but not huge amounts of ambient humidity as such. I would not attempt it if your enclosure is under 4 foot and as adults they would need a huge space to stay out of each others way.