はさておき => setting aside ~ N2
Trend
お…くださる => Please do ~ (honorific) N3
Respectful, humble
させておく => Leave it alone, don't interfere N2
Position, perspective
まさか...とはおもわなかった => never thought that N3
Surprised
はさておき => A aside; putting A aside, B (new topic) N1
Miscellaneous
いささか => a bit N3
Evaluate
お => Prefix N5
Respectful, humble
さ => -ness N4
さえ/にさえ/でさえ => Even N3
Not only, Not even
さあ => well N3
Suggestion
...どおし => Throughout N3
Continuous
さえ/でさえ => even; so much as; not even N3