“Re davening with the shatz – again it is a form of tefillah btzibbur but not as mehudar – that’s the commom consensus but I’ve heard bshem Chasam Sofer that he held actually it is a mehudar Tefillah.” When davening in a factory you can hav a whole minyan tagging along with the Shatz.
“but from Yishtabach till Shemonah Estrei, you can’t skip anything.” There may be some wiggle room (needs Rabbiinic advice) if you already said Shema before see Mechaber Siman 60 seif 2
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