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Unfortunately, getting the user_pseudo_id directly from GA4 is not straightforward, owing to privacy restrictions by Google. There used to be methods using Universal Analytics (UA) or reading the _ga cookie directly, but these either do not work with just GA4 or are explicitly recommended against by Google. If pulling data from Big Query is not an option for you, it might be worth revisiting the other options and trying to tweak your setup to make them work, such as installing a UA tracker in parallel to your GA4 setup. If that’s not possible, I’m afraid there might not be another way to get the user_pseudo_id with the current capabilities and policies set by Google.
