The MaxQ blueprint action spkcpo returns the state of a specified target relative to a constant position “observer”.

From the SPICE documentation:

spkcpo
Abstract
Return the state of a specified target relative to an “observer,” where the observer has constant position in a specified reference frame. The observer’s position is provided by the calling program rather than by loaded SPK files.

This can be used to obtain state information at fixed locations in a fixed frame.

2022 JAN 19 02:32:36.940 UTC
[(346758.46, -129593.08, 144072.03); (-9.3086562, -24.24794, -0.24873608)]
1.32502

The values above are:
Epoch
State: Kilometers; Kilometers/Second
Light Travel Time: Seconds

Note that the velocity is primarily due to the Earth’s rotation. The Moon transits Earth’s sky approximately once per month by its own orbit, but once per day due to Earth’s rotation. So, the Moon’s motion through IAU_EARTH should be approximately 30x larger than its velocity through J2000. And it is. Compare the above to the results of spkezr/J2000:

[(-256387.71, 259021.9, 148136.81); (-0.7185901, -0.62086363, -0.24174899)]

(0.980 km/s for J2000, vs 25.97 km/s IAU_EARTH)

Also see

spkcvo
Abstract
Return the state of a specified target relative to an “observer,” where the observer has constant velocity in a specified reference frame. The observer’s state is provided by the calling program rather than by loaded SPK files.

spkcpt
Abstract
Return the state, relative to a specified observer, of a target having constant position in a specified reference frame. The target’s position is provided by the calling program rather than by loaded SPK files.

spkcvt
Abstract
Return the state, relative to a specified observer, of a target having constant velocity in a specified reference frame. The target’s state is provided by the calling program rather than by loaded SPK files.