Hi,
Unfortunately the flare vector can't be added to the live view. The other star detection algorithm results are also not available in live view. To make this available requires quite some restructuring of the code to make it work. Maybe it can be submitted as a feature request. But I think the live view was not intended to support this behaviour (but I could be wrong here, as I am quite new to developing to kstars and ekos).
Regards, AstroRunner