That vine thickness is insane. Totally different than the thin green vines of the hardy hybrids I’m growing.
although not impossible. But 99.9999% of us will never have to consider hexaploid passiflora.
And those 0.0001% that do, have a laboratory, colchicine and experience with chromosome doubling. And than your likely considering other things to (and are already aware of ploidy etc).
For virtually all of us, we only have to worry about it being diploid (which most are) or if it’s a tetraploid or offspring of tetraploid (which a few are)
lets not make it more complicated than necessary 
I’ve used caerulea to pollinate incarnata and had consistently good fruit quality. I never had any hollow fruits. Not all the flowers set fruit though, despite pollinating all of them, but I think that’s normal even with optimal pollination. Approximately 40 fruit per plant (compared to 100+ flowers).
My caeruleas tend to generate a lot of pollen, more than my edulis and incarnata. My success with pollinating edulis with caerulea has been lower for now, but the two edulis plants are still young (2 flowers in fall 2024, 2 flowers in summer 2025, 7-8 flowers in October 2025). The 2024 flowers didn’t set fruit, the summer 2025 did, but were half empty (some pulp but not much). The October 2025 one is finally starting to ripen and feels significantly heavier so we’ll see how it turns out.
My caerulea has also been effective at pollinating my passiflora inspiration (a hybrid variety).
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I found some passiflora maliformis in Ecuador. They were quite tasty, with lots of pulp and not much seeds, so it would be a good one if you can grow it successfully. They were growing at fairly low elevation (500m), but in an area that’s cooler than most other low elevation tropics, with days averaging around 25-27C (80F) and nights around 18-21C (65-70F). The climate was humid with lots of clouds and fog, and regular rainfall (although mostly lighter rainfalls for the few days I was there).
It looks very similar to the vine of the passiflora ligularis I have. My edulis and caerulea also have a similar thickness, but are green rather than brown. My manicata is also brown and fairly thick but not as rugged as the ligularis/maliformis.