Mac Python環境からalembicでmysqlを繋げたい

前提・実現したいこと

alembicでDBマイグレーションがしたい。
OS：MacOS Mojave 10.14.5

発生している問題・エラーメッセージ

https://pypi.org/project/mysqlclient/
↑に従ってmysqlclientをpipenv isntallしている際に発生。
ここのmysql_configおよびopensslの設定はしている。

brew install mysql-connector-c
を叩くと以下のエラーになる。

mysqlとmysql-connector-cは共存できないのでしょうか？

Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> Updated Formulae
atomist-cli                                                                                                                          platformio

Error: Cannot install mysql-connector-c because conflicting formulae are installed.
  mysql: because both install MySQL client libraries

Please `brew unlink mysql` before continuing.

Unlinking removes a formula's symlinks from /usr/local. You can
link the formula again after the install finishes. You can --force this
install, but the build may fail or cause obscure side effects in the
resulting software.

事前にmysqlはbrew install済

この状態で、alembic upgrade headすると。

Traceback (most recent call last):
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/bin/alembic", line 10, in <module>
    sys.exit(main())
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/alembic/config.py", line 540, in main
    CommandLine(prog=prog).main(argv=argv)
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/alembic/config.py", line 534, in main
    self.run_cmd(cfg, options)
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/alembic/config.py", line 514, in run_cmd
    **dict((k, getattr(options, k, None)) for k in kwarg)
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/alembic/command.py", line 276, in upgrade
    script.run_env()
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/alembic/script/base.py", line 475, in run_env
    util.load_python_file(self.dir, "env.py")
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/alembic/util/pyfiles.py", line 90, in load_python_file
    module = load_module_py(module_id, path)
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/alembic/util/compat.py", line 177, in load_module_py
    spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "alembic-db/env.py", line 75, in <module>
    run_migrations_online()
  File "alembic-db/env.py", line 60, in run_migrations_online
    poolclass=pool.NullPool,
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/sqlalchemy/engine/__init__.py", line 478, in engine_from_config
    return create_engine(url, **options)
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/sqlalchemy/engine/__init__.py", line 435, in create_engine
    return strategy.create(*args, **kwargs)
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/sqlalchemy/engine/strategies.py", line 87, in create
    dbapi = dialect_cls.dbapi(**dbapi_args)
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/sqlalchemy/dialects/mysql/mysqldb.py", line 118, in dbapi
    return __import__("MySQLdb")
  File "/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/MySQLdb/__init__.py", line 18, in <module>
    from . import _mysql
ImportError: dlopen(/Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/MySQLdb/_mysql.cpython-37m-darwin.so, 2): Library not loaded: /usr/local/opt/mysql-connector-c/lib/libmysqlclient.18.dylib
  Referenced from: /Users/kota-ishizuka/.local/share/virtualenvs/kotapypj-_J8aX8wv/lib/python3.7/site-packages/MySQLdb/_mysql.cpython-37m-darwin.so
  Reason: image not found

試したこと

ここに書いている通り、brew unlink mysqlをするとinstallされるが、mysqlコマンドが打てなくなる。

補足情報（FW/ツールのバージョンなど）

Pipfileは以下の通りです。

[[source]]
name = "pypi"
url = "https://pypi.org/simple"
verify_ssl = true

[dev-packages]
ipython = "==6.2.1"

[packages]
pandas = "*"
selenium = "*"
sqlalchemy = "*"
pytest = "*"
jupyter = "*"
alembic = "*"
django = "*"

[requires]
python_version = "3.7"