ぐらいのものだ => Only A N1
(Not)only , (Not) even
の+ [至「いた」]り => Very A N1
Degree/ Level/Amount
ないものでもない/ないでもない => A is not completely impossible N1
Need/Requirements
たいものだ => Want to A N2
Will, Decision, “Doing”
と[言「い」]うのは => Means, is N3
Information, Report
というものではない => Not sure, not means N2
Information, Report
か~ないかのうちに => Right after A, C N2
Time, Situation
[際「さい」]して/に([際「さい」]し)/に[際「さい」]しての => At the time of A (which starts now).. N2
Time, Situation
ことのないように => So as not to A N1
Will, Decision, Doing
[可能系「かのうけい」] => Can, be able to, be possible to N4
Can, Should, Must
というものだ => Shows an especially strong conviction A of the speaker N2
Information, Report
てからというもの => After A (happens), B changed (major change, everything changes) N1
Information, Report