Use custom Base_64 dictionary for passlib.hash.scrypt

Question

Is it possible to specify a custom Base_64 dictionary when encoding data within passlib?

I have a requirement to generate 'scrypt' encoded passwords on a system that does not allow the '+' character within its configuration files.

More specifically the custom dictionary used is = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'

Opposed to the standard dictionary = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'

Using the code:

import sys
import re
from passlib.hash import scrypt

char = re.compile(r'[a-zA-Z0-9()!#$%^&*.,+=_-]')

def main():
    try:
        pwd = input('\n' + 'Enter a Plain Text Password to Encrypt: ')
    except KeyboardInterrupt:
            sys.exit(0)
    else:
        if len(pwd) > 64:
            print ('Password must be between 1 and 64 characters. Try again.')
            main()
        else:
            if (char.match(pwd)):
                hash = str(scrypt.using(rounds=14, salt_size=10).hash(pwd))[21:]
                print ('\n Your hash is: ' + hash)

            else:
                print ('Illegal characters. Try again.')
                main()

main()

It will occasionally output '+' characters, which my system does not support.

Your hash is: $o/ReK+U8JyRkbA$W6zFHBmebC4LwkTN+rB8kSgUbDK0Zo4p2z7CCwvJOXk

If I'm not mistaken, the characters also have to be in the correct order within the dictionary.

Is there a way to specify a custom dictionary with passlib? Or is there a better way to achieve this?

The 'salt' is also encoded using the same standard dictionary, which also needs to make use of the custom dictionary.

-Brett