Yeah I would imagine that you would not want to replace the whole thing lol.I'd not want to replace my $2000 high end speakers in case my Airport Express fails.
What kind of Airplay adapter are you referring to, can you suggest any specific hardware (preferably in the price range of the Airport Express)?
I don’t have any suggestions actually. I haven’t really looked into it. I believe there are at least Bluetooth adapters for systems but that’s all I got.