KYB for non-US entities onboarding US-based crypto firms – specific documentation requirements

Anyone dealing with KYB for non-US entities that are trying to onboard with US-based crypto firms? We're running into a brick wall trying to standardize documentation for beneficial ownership and source of funds when dealing with jurisdictions like Belize or Panama. The usual registry lookups are often incomplete or just not equivalent to what FinCEN expects. Are you pushing back on the US firm's requirements, or is there a common workaround for getting robust, verifiable docs from these places without creating a compliance nightmare down the line? It's becoming a major bottleneck.