The VU+ receiver is the worst option for using CI+, at least on openPLi.
I dont agree since most of CI+ modules work fine with Vu+ boxes with OpenPLi develop without any additional plugins...
I dont see any issues with zapping and oscam in parallel if the settings are correct.
In fact Pulse4K working worst than Vu+ (at least with my CI+ module...dont know about Kebelio) and have to be installed a plugin so to work ok and still even with the plugin sometimes i get a black screen on zap. I dont have that issues with Vu+Duo4KSE without any plugins.
That with OpenPLi develop...