This is an amazing idea as a software firewall is necessary for most Windows 10/11 users:
Originally, my plan was to setup a HARDWARE firewall device that’d connect to my Router but then I realised that this entire firewall device could be bypassed if a Windows PC has a backdoor way of communicating to a malicious user online.
My thread may help you:
Software Firewall for Windows? - #75 by Average_Joe
You forgot to mention Safing postmaster which is open source and cheap: