Today i got visited with this video from UNifi, that their new Version of Protect 5.0 Now supports Third party Cameras.
I had to confirm this from their website Again UniFi Network Video Recorders - Ubiquiti
and Alas… Now i have a reason to buy…
Not sure what the new thing is, but I have been using Zoneminder in the past.
It can handle virtually every IP camera out there…
https://zoneminder.readthedocs.io/en/latest/installationguide/easydocker.html
Your “weekend project”? 
I have actually been window shopping for a potential CCTV solution for NS8.