Onboarding Friction for EU Residents - Any shared experiences?

Hey everyone, I'm fairly new to actively trading with significant capital and have been trying to set up accounts with a couple of different brokers lately, mostly focusing on those with decent API access for automated strategies. I've hit a bit of a wall with the Know Your Business (KYB) process for a few of them, particularly with a couple of UK-based platforms. It seems like the requirements for proving residency and source of funds for EU citizens, even post-Brexit, are incredibly stringent and often lead to lengthy delays or outright rejections based on minor discrepancies.

I'm curious if others here have encountered similar levels of friction, especially when dealing with brokers regulated in different jurisdictions from your own. Is there a common pitfall I might be overlooking, or is this just the new normal for navigating compliance when you're not going with a local provider? It's becoming a real drag on getting set up and deployed. Any shared experiences or tips for streamlining this part of the process would be really appreciated.