Reading through pybombs recipe for limesuite they actually explicitly disabled the GUI (-DENABLE_GUI=OFF) - probably to reduce the number of dependencies, to make it faster and easier to install. So my guess is that the pybombs install is being used for lms7 API access to the physical devices only. Probably to reduce bloat so that it will use less storage on smaller SoC boards.
I’d be inclined to “git clone git://github.com/myriadrf/LimeSuite.git” the source code for limesuite from and install a second copy for GUI access only in a non standard path like /opt so that gnuradio could not find it, and accidentally use it. I’d mostly follow this http://wiki.myriadrf.org/Lime_Suite#Building_from_source with a change for the cmake command.
cmake -DCMAKE_INSTALL_PREFIX=/opt …/