Wow, what a price to pay!And no frozen!
What about canned?
Straining the seeds is not difficult Maito, you can actually leave them in, but I use a hand strainer ~ a bowl shaped metal sieve, put the passion fruit in using a jug underneath ~ then just use a spoon to push/stir the pulp through until all the juice comes through, scraping the under side of the sieve a few times as I go. I also let it stand a while to make sure it has all drained.
If that makes any sense! ;)