Hi,
We created a 3D printable case for the Beocreate with a Rpi4, we added a fan to cool it down.
https://www.thingiverse.com/thing:6658426
To control the fan you can use a python script :
https://github.com/vincss/beocreate-remote/blob/main/doc/fan.py
And make it a service :
https://github.com/vincss/beocreate-remote/blob/main/doc/fan.service
Don't hesitate to reach me if you need any help with it. :-)