Yes, there's a way around this....
Create a routine where the trigger is you saying "Alexa, Radio one" [radio two, radio three...]
Now, on action, select MUSIC and, on the setting screen write the precise name of the station and select TuneIn as the FROM. You can even set a timer if you can.
After clicking on Next you'll return to the routine's main editing screen. Once there click on CHOOSE DEVICE and select "The device you speak to".
That's it. Now you can create a full list of "shortcuts" to your favorite radio stations and call it from any of your echo devices.