First, make a copy of Sol.cfg. Name the copy "Sol_lowmoon.cfg"
Second, make a copy of Moon.cfg and name it "Moon_low.cfg"
Remove the "Module=Moon" part from the copy to replace the ephemeris module with a standard Kepler element propagation.
Include the Kepler elements of the desired orbit instead: Epoch, SemiMajorAxis, Eccentricity, Inclination, LongAscNode,
LongPerihelion and MeanLongitude.
Keep the "Name=moon" line, as this is important for the textures.
In "sol_lowmoon.cfg", replace the "Earth:Moon1=Moon" line by "Earth:Moon1=Moon_low".
Done. Now you just need to select "Sol_lowmoon" instead of "Sol" as solar system in your scenarios, to have the moon lower as
usual.