Step-By-Step: Implementing Azure AD Password Protection On-Premises

Hi tobyraistrickinseego ,
your feedback is really appreciated! ♥ :).

The only thing that I know about the Microsoft Global Banned Password list is listed here:
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The contents of the global banned password list aren't based on any external data source, but on the results of Azure AD security telemetry and analysis.
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So is not public available, and is not based on external data sources.

I don't know Safepass, but if this software act as a password filter on the DC probably can work with AAD PP:
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Is it supported to install Azure AD Password Protection side by side with other password-filter-based products?

Yes. Support for multiple registered password filter dlls is a core Windows feature and not specific to Azure AD Password Protection.
All registered password filter dlls must agree before a password is accepted.
Reference: On-premises Azure AD Password Protection FAQ | Microsoft Docs

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IMHO is always better to make tests on a pre-production Environment even if the documentation tell us "Yes should work" ;). 
Many Thanks for your question 😉
Daniele De Angelis