The concern of bottlenecking here and overall is largely unnecessary, lets assume that's the case with these specs, so the solution would be to add a less capable card, why? if you were to downgrade the GPU so that there's, technically speaking, no bottleneck at all, all you'd be getting is even less frames per second, you should only worry when your GPU is less than ideal, not when it's seemingly 'more capable' than the necessary.
if there was an imposing bottleneck to the point of having split second freezes or stuttering, your cpu was not adequate to play modern games just to being with, it isnt about the bottleneck.
go for the 2060