the use by some of: “H-shem”
has been explained before. no one is claiming it to be a chumrah, and certainly not a Halachah
it is merely a personal heirgush.
and should certainly not be denigrated.
personal heirgush? heir gush? Herr Gush?
not sure what you mean by that.
Personally I think it has basis from a geomorah (as I said), but have never seen anyone else say so.