Might it make sense for NASA to use Kliper (if it happens) for access
to Low Earth Orbit?

Kliper could be launched on an exisitng EELV platform, so would avoid
the need to develop the Stick / Kebab / White Elephant.

Or is it the other way round? The need to justify the Stick means NASA
can't use Kliper.

It seems competition for Kliper at concept stage presently comes from
T-Space's air launch option.