[Python] tcl-tk (tkinter) not installing via Homebrew pyenv on MacOS Mojave

If I do this on MacOS Mojave in Homebrew:

$ brew install tcl-tk
$ brew install pyenv
$ pyenv install 3.7.4
$ pyenv global 3.7.4
$ python -m tkinter -c 'tkinter._test()'


I get:

Traceback (most recent call last):
File "/Users/craign/.pyenv/versions/3.7.4/lib/python3.7/runpy.py", line 183, in _run_module_as_main
mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
File "/Users/craign/.pyenv/versions/3.7.4/lib/python3.7/runpy.py", line 142, in _get_module_details
return _get_module_details(pkg_main_name, error)
File "/Users/craign/.pyenv/versions/3.7.4/lib/python3.7/runpy.py", line 109, in _get_module_details
__import__(pkg_name)
File "/Users/craign/.pyenv/versions/3.7.4/lib/python3.7/tkinter/__init__.py", line 36, in <module>
import _tkinter # If this fails your Python may not be configured for Tk
ModuleNotFoundError: No module named '_tkinter'


I've been searching for days, and have tried various solutions such as here but without luck so far. Any ideas why I'm getting this error and how to fix it?

Thanks in advance!

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