Thanks for the notes.
Could you indulge me and explain why the peyyala instruction in the Catukkanaya discussion of rupavacarakusala dhamma must contain the vipassana definition found in para 55? Para 55 is found in the kamavacarakusala's Padabhajani laundry list of dhammas. Are we supposed to pluck out everything in paras 2 onwards pertaining to the kamavaracarakusala arupi dhammas and export them wholesale to the rupavacarakusala lists? The same peyyala instruction is also given in the arupavacarakusala dhammas and it should be very clear that stuff such as piti, sukha, vitakka, vicara etc etc from the kamavacarakusala list has no place in the rupa (at least beyond the 1st and 2nd Jhanas for the examples cited) list, much less the arupa list. So, how does the Dhammasangani instruct us as to which of the kamavacarakusala dhammas is pertinent to and to be repeated in the rupavacakusala and arupavacarakusala lists?
I think I see where the problem is with our discussion of the Petakopadesa. You've offered an English translation of that text, where vitakka and vicara are rendered "directed thought" and "evaluation" respectively, with the corresponding denominative verb being rendered "thinks". I'm not accusing you of sleight of hand, but don't you think that reliance on this particular English translation is simply begging the question in the issue "What does vitakka-vicara mean?"
Since you've mentioned that MN 117 looks "Abhidhammic", what do you think about Mrs Rhys Davids's suspicions about the status of MN 111 as not originating from the Buddha's time? Unlike MN 117 which has at least a parallel, MN 111 is completely unique in the corpus of Early Buddhism. Nevertheless, for the sake of discussion, I'll treat MN 111 as canonical.
Pls give me some time to gather my thoughts coherently on the "arising from the attainment" issue in MN 111. While I share part of your belief about the role of sanna in the preceding 7 attainments, I do not take the view that there is a necessary temporal conjunction between the sanna refrain and the vipassana refrain.