I DO see that issue - it never comes up for me, because (I remember now), I always stop loading instruments at either 4 or 5, for a single instance of Kontakt.
If I need any more instruments, I add an additional Kontakt instance.
Seems to be the way it works at this point in time, to the best of my knowledge.
Up until 4 or 5 instruments though, it works fine.
I just checked the size of Kontakt 5, in the vstplugins folder, and the 16 out dll is only 558k in size, if that helps any. There is a Kontakt 5 dll that runs at 37 MB, but I am loading that 16-out version, so you might be able to get away with loading that additional instance.
Give it a shot and post back.
Bob Bone