the pds ftp page has a spice kernel for all 20 pulse a few
ftp://ssd.jpl.nasa.gov/pub/eph/satellites/bsp/Code:
brief -c sat428.bsp
BRIEF -- Version 4.0.0, September 8, 2010 -- Toolkit Version N0066
Summary for: sat428.bsp
Bodies: SATURN (699) w.r.t. SATURN BARYCENTER (6)
65035 w.r.t. SATURN BARYCENTER (6)
65040 w.r.t. SATURN BARYCENTER (6)
65041 w.r.t. SATURN BARYCENTER (6)
65045 w.r.t. SATURN BARYCENTER (6)
65048 w.r.t. SATURN BARYCENTER (6)
65050 w.r.t. SATURN BARYCENTER (6)
65055 w.r.t. SATURN BARYCENTER (6)
65056 w.r.t. SATURN BARYCENTER (6)
65065 w.r.t. SATURN BARYCENTER (6)
65066 w.r.t. SATURN BARYCENTER (6)
65067 w.r.t. SATURN BARYCENTER (6)
65068 w.r.t. SATURN BARYCENTER (6)
65069 w.r.t. SATURN BARYCENTER (6)
65070 w.r.t. SATURN BARYCENTER (6)
65071 w.r.t. SATURN BARYCENTER (6)
65072 w.r.t. SATURN BARYCENTER (6)
65073 w.r.t. SATURN BARYCENTER (6)
65074 w.r.t. SATURN BARYCENTER (6)
65075 w.r.t. SATURN BARYCENTER (6)
65076 w.r.t. SATURN BARYCENTER (6)
65077 w.r.t. SATURN BARYCENTER (6)
65078 w.r.t. SATURN BARYCENTER (6)
65079 w.r.t. SATURN BARYCENTER (6)
65080 w.r.t. SATURN BARYCENTER (6)
65081 w.r.t. SATURN BARYCENTER (6)
65082 w.r.t. SATURN BARYCENTER (6)
65083 w.r.t. SATURN BARYCENTER (6)
65084 w.r.t. SATURN BARYCENTER (6)
Start of Interval (ET) End of Interval (ET)
----------------------------- -----------------------------
1899 DEC 20 00:00:00.000 2100 JAN 02 00:00:00.000
with one kernel there should not be much of a performance hit