Usernames and Multisite

I’m having issues. I have a website It’s in multisite (because I plan to later add more sites to the network). but it’s the default site(not in a subdomain or subdirectory). Also, users of my site are not making a subsite, they are simply registering to use the website

It doesn’t allow users to register with usernames other than one word, all lowercase usernames.

I added a must-use plugin that allows uppercase names to be used which I found here:
https://premium.wpmudev.org/forums/topic/allowing-caps-in-usernames-etc/
However, this won’t allow spaces or hyphens in usernames.

Next, I added this to my functions file which I found here:
https://christianvarga.com/allow-hyphenated-usernames-wordpress-multisite/
But this overrides the first thing I added. It only allows for lowercase usernames with hyphens.

I need to be able to let users register with:
1. Uppercase Letters
2. Lowercase Letters
3. Numbers
4. Hyphens
5. Spaces

Is there any way to do it? I know if I just export the site and make it non-multisite I can achieve this because it’s the default WordPress behaviour.