And how is it in terms of size?

Hi Julian
I can't tell you if the FeiYu Tech gimbal is compatible with the remote control software, but in terms of weight it should definitely work. I've filmed with a Fujifilm X-T2 up to now and was extremely satisfied. The Blackmagic should be about the same weight or even lighter. go to the FeiYu Tech website, maybe you'll find out more.
Greetings Pius