KYB onboarding for non-US entities – beneficial owner verification challenges?

We're seeing increasing friction on the KYB front when onboarding non-US entities, particularly for funds and trusts with complex ownership structures. Beyond basic documentation, what are others finding to be effective strategies or vendors for robust beneficial owner verification, especially when dealing with layers of shell companies in jurisdictions with less transparent registries?

Specifically interested in solutions that can help streamline the process without disproportionately increasing manual review, and how you manage the ongoing monitoring aspect for these more opaque structures. Regulatory scrutiny seems to be ratcheting up across the board for beneficial ownership.