My thinsulate duck hunting bibs are much warmer than my turnout pants and coat. Pus they are much more flexible and easy to don. they have zippers up the side all the way up to mid thigh, you can put them on without taking your winter boots off.. Turnout boots do not really keep your feet warm with steel sole plates and arch supports.
Our uniform parkas have both the BBP lining and a removable inner fleece inner liner under the high vis dayglow lime ANSI 3 outer shell. A FF balaclava is a good idea for head and face protection from severe cold & wind. Until it ices up from exhaling through it
As far as limiting time outside in Extreme conditions, You sometimes don't have the resources available to make that happen. In rural areas, The next due service could be 30 minutes to an hour away.