As far as #5 goes, right out of the Contract, Paragraph 8.C.3.4.d:
Travel claimed as a deviation expense must begin or end
within 3 days of the scheduled assignment to/from which
the pilot is deviating (e.g. scheduled deadhead, trip or Rday)
and must proceed to the intended destination of the
deviation with no greater than a 24 hour delay enroute,
domestically, and a 48 hour delay enroute internationally.
Which seems to give you more leeway than 72 hours, BUT it might be worth an email to the Contract folks.