Navigating PSP onboarding for global payments

We're expanding our payment rails to new regions and have been consistently running into significant friction with PSP onboarding, particularly around KYB for emerging markets. It's not just the document requirements, but the back-and-forth, the timelines, and the often-vague communication that's slowing us down. Has anyone found a more streamlined approach or perhaps a PSP that truly excels at global KYB, especially for high-volume, lower-value transactions where the operational overhead can really eat into margins?