When my clients demand strict brand adherence, I usually lean on Beautiful.ai....

https://www.coast-bookmarks.win/here-are-a-few-options-based-on-my-experience-working-with-global-clients-who

When my clients demand strict brand adherence, I usually lean on Beautiful.ai. It’s one of the few tools that actually respects your master slides rather than just flattening everything into a vector mess