[Avodah] oseh hashalom

[Sholom Simon via Avodah]

The most commonly cited reason that we say "oseh hashalom" rather 
than "oseh shalom" in kaddish during the 10 days, is that the 
gematria of hashalom is equivalent to the gematria of Safriel, the 
malach that "writes" us into the Book.

(I just recently read somewhere else: "Hagahos Mordechai [Miseches 
Rosh Hashanah 720 he states as follows: Safiriel is the Gematria of 
Oseh and Oseh is the Gematria of Hashalom. Alternatively this hints 
to the kindness of Hashem that swerves the judgment to merit in a 
case that the sins and merits are equal, and the verse states "Maaseh 
Hatzedaka Shalom"."  (I don't understand this second reason: the 
"sholom" in that last phrase doesn't have a "hey")

I find it a bit odd to change the nusach of something so important as 
kaddish because of gematria.  Do we see that elsewhere?  (Or, are 
their other reasons I am missing?)

KvCT!

-- Sholom