Opamp + buffer, how to bypass buffer at HF for unity gain?

[Christer]

Ppl,

thanks for your suggestions. I will use an output resistor, of
course, but have never heard of/thought of the ferrite-bead
method before. As with many things, it is obvious in retrospect,
when somebody tells you. I am not sure i will need it, though.
I will also consider the other suggestions you made.

However, my original problem was solved by jcx. Of course,
if someone had told me to draw a unity-gain op amp
configuration, I would have done it right. But I was so stuck
into my design and various historical design decisions in it
that I missed the obvious.