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What you can do is run Windows through Proxmox.

On Linux, I use OpenSnitch. The name's based on LittleSnitch. Its a layer 7 firewall. Quite polished these days.

Discussions: https://hn.algolia.com/?q=nirsoft

It's not Open Source, just freeware. I would not trust anything not Open Source to filter my connections.

Somehow the code is not linked in the blog posts, but it seems to be there: https://github.com/objective-see?tab=repositories

Not open source comment was for Nirsoft, not about Objective-See (and I just checked, source code link is present on home page as well as individual articles)

I am working on this, https://www.appswithcode.org/?q=windows , It is far from ready, but it is meant to solve such problems.