Python script to generate Brainfuck that prints strings with multi-byte characters:
string = "Hi 😊"
for b in bytes(string, 'utf-8'):
print(b)
print("+" * b + ".>")
A shorter one for bytes that are close to each other
string = "Hi 😊"
last = 0
for b in bytes(string, 'utf-8'):
diff = b-last
last = b
print("-+"[diff>0] * abs(diff) + ".")