I think BLM will be able to do a 5xF4 rotation and 7xF4 opener in 3.2. I did some experimenting today and was able to stack enough PIE to get it in, at the cost of dropping me below 1k INT. Relevant stats are posted in the video's description.
Proof of Concept here
It should take 15 Piety V materia to get myself to enough MP to insert a T1 after B3 (assuming Dunesfolk base PIE). Assuming YoshiP keeps his promises and crafted gear can compete with raid gear, AND that crafted right-side has 2 regular slots and left-side has 1, you'll be able to fill up your LHS with Piety V, some of your RHS with Piety V, and overmeld SpS to some cap to ensure everything fits in. This comes at the cost of having hardly any space to meld Crit/Det/Twelve forbid we'd need to meld Accuracy. Having done absolutely no number crunching beyond checking how much MP is needed, I think an extra F4 per B4 would be a much larger benefit than a bit of extra damage-boosting secondary stats.
