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Zaps are designed to work on one request at a time, so they aren't suitable for this bulk task, especially given API limits.
Marketo's outbound webhooks similarly work one one lead at a time, and even though you can run thousands of leads through a 'hook, since they only fire for existing leads they can't be used to upsert new leads into a list.
Sounds like you need a solution that uses the Bulk API, assuming you have a batch of possibly net new leads to work on at a time.
Thanks for getting back to me. This helps a great deal.
I'm reviewing Marketo's API documentation and it looks like I will need to leverage the add to list operation from static lists.