I'm running gnuradio 3.7.11 and I'd like to dump the bytes output of a GFSK demodulation block into a vector sink. However, the QT GUI vector sink block in gnuradio companion seems to be a float type only. I know I can use different vector sink types in code but, Is there any way to switch the type of a vector sink to bytes in the companion?
No, you can't. The qt GUI vector sink simply doesn't exist for 8 bit integers.
Simply convert to float using the existing conversion blocks.