But you can't just pick up the phone, dial the number, and read off of a script you have prepared beforehand. You need to be able to hear what's being asked and answer accordingly. At the "I don't know any Japanese" level, they will know instantly from your pronunciation that you're not Japanese anyway, so why not just show up in person, walk around and see where you can get in. There's already some well-reviewed souplands that are foreigners-friendly here that I'm sure you've read about, if what you said is to be taken at face value
And for the record, the best working "trick" to share around here is to pick up a textbook and learn some Japanese