まず...だろう/ ...まい => Surely... N2
Speculation
ましょう => let's ~; shall we ~ N5
ますように => making a wish N3
てしまう => Did something N4
Secondary Verb
うと~まいと,うが~まいが => Whether or not A (is/occurs) N1
Based/focused/depending on
~とおもうまもなく => Suddenly~ N1
Right after...
~ ほうがましだ => better than; would rather ~ N1
Evaluate
いまさらのように => Now... again... N2
Time
ようと...まいと => whether or not; regardless N1
Innocent
~ようが...まいが => whether or not; regardless N1
ようか~まいか => whether or not; considering options N2
てしまう => to do something by accident, to finish completely N4