After much digging, I've found a solution (with some caveats) -
you'll need both homebrew and pyenv installed for this to work. The idea is to replace your old deprecated tkinter installation with an up-to-date one that actually works*
Note that this will wipe out any packages you’ve installed with pip - back those up first!
Run the following commands
brew uninstall tcl-tk uninstall the old tk if you have it
pyenv uninstall 3.10.5 ...or whatever your current global Python version is
brew install tcl-tk grab a fresh install of tk
pyenv install 3.10.5 grab a fresh install of Python 3.10.5
pyenv global 3.10.5 set your global Python version
You need to install tk via homebrew before installing Python with pyenv because pyenv will automatically try to use whatever tk package it can find when it installs Python.
Final Thoughts
If you don't already have homebrew installed, here are good instructions
If you don't have pyenv, just run brew install pyenv
You’ll probably need to select your preferred Python interpreter in VSCode again
*This worked for me - YMMV