I've tried rice crispy treats with brown rice and peanut butter «sludge» as you call it before, but I never thought to use agar agar flakes or pistachios.
In a shaker jar with lid, combine AVOCADO OIL, RICE VINEGAR, AGAVE NECTAR, RED CHILI PEPPER FLAKES, and SALT / PEPPER (to taste); shake vigorously until well - combined, chill until ready to use, and shake again before using.