Onboarding for a multi-jurisdictional prop firm setup

Anyone dealing with prop firms across different regulatory environments – how much of a headache is the onboarding and KYB process becoming? I'm trying to navigate a setup that requires a base in one jurisdiction for tax, but trading via another for better market access/liquidity. The paperwork and verification needed for both sides, plus the PSPs, is starting to look like a full-time job. Are there specific regions that are notoriously difficult, or any that have surprisingly streamlined processes for professional accounts?