3👍
You may want to have a look at the new Google Cloud Scheduler service (in beta at the moment), which is a fully managed cron job service. It allows you to create cron jobs programmatically via its REST API. So you could create a specific cron job per customer with the appropriate schedule to fit you needs.
2👍
Given this limit, my guess would be NO
Free applications can have up to 20 scheduled tasks. Paid applications can have up to 250 scheduled tasks.
https://cloud.google.com/appengine/docs/standard/python/config/cronref#limits
Another version of your minute-by-minute workaround would be a daily cron task that finds everyone that wants to be launched that day, and then use the _eta argument to pinpoint the precise moment in each day for each task to launch.
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