Hot answers tagged nuschaot
The artscroll siddur contains yotzrot for shabbat shkalim, zachor, parah, hachodesh and hagadol
Siddur Tefilla Hashalem -- A. Greenwald
There may be other practices out there, and it's confusing to learn the responses of another nusach, but Rav Moshe Feinstein's position was that anything communal and out-loud -- including the kedusha response -- should follow the kehilla's nusach.
The Kamatz-Katan version was introduced by R SZ Hanau (Shaarei Tefillah 300) by comparison with verses like Genesis 42:10. His Siddur indeed has a Makkaf. Later editions seem to have either taken the Makkaf as assumed or omitted it through ignorance. It seems the original version had the full Cholam.
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