There's an
extensive thread about passionflower, perhaps you've taken a look there already?
With your herb store passiflora typically you'd be needing kilos of the stuff to obtain a worthwhile amount of harmala alkaloids - although some of the measured MAOI activity of the plant may come from other non-alkaloidal substances and it is not clear if these compounds would contribute towards the activation of DMT. Syrian Rue shouldn't be that difficult to track down and is essentially of guaranteed efficacy.
“There is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
― Jacques Bergier, quoting Fulcanelli