You have raised some vital questions / opinion for the facts faced of your case(s), which may be:
(1) Res Judicata/Estoppel: Divorce Failed she can't relitigate.
Ans: Yes, it do not attract res-judicata and estoppel, however, appeal is a fundamental right which cannot be taken away by opposing party.
(2) Changed Circumstances: RCR decree shifts the footing in my favor.
Ans: Did you file execution petition of the RCS decree ? If so, what do you propose if the judgment debtor (your wife) do not join your company as per decree ? How do you / Court propose and compel her to rejoin her matrimonial home ?
(3) Equity : Deserting wife with income can't jail husband for an infructuous interim order.
Ans: Have you challanged interim order passed in favour of your wife ? How much is outstanding amount as per award ?
(4) Part Payment : Shows my bona-fide intent to comply with the arrears, so civil arrest is unnecessary at this point of time.
Ans: Generally (not specifically) the judgment debtor is compelled to clear outstanding decreetal amount, which differs from case to case.
(5) S24 Vs Sec 125 CrPc. : Unlike Sec 125 CrPC, Interim maintenance under S24 is a monthly commitment. Each month of default gives rise to a new cause of action.
Ans: It is an academic topic for debate and discussion where no such straight jacket formula exists, as stated by you.
If you have been appearing, proceeding and contesting the case(s) as party-in-person for the last 10 years (as stated by you) you are very well aware about facts and circumstances of the case(s), intelligent enough, competent and capable to analyse, find pros and cons of the proceeding, in such circumstances what for do you need any other advise / obligation of experts on this platform meant of needy litigants.