hah! thanks for that. Maybe you could betatest for us or something? Have a chat with @arnoldvilleneuve about that if interested. Testers are kind of something we will need very soon. We already have a working prototype going, but we have lots more planned in terms of alternate deployment options too.
As for scripting, feel free to ask - or just request a change if there's something you need. I have plenty of hair left so I can save you some of yours 
You can run the same script there. Just make a second location for the second PC in the settings.
You can limit rclone's speed with --bwlimit 10M (megabytes/sec, not mbit). Setting to approx 8.5M will make it never hit a limit with 24/ uploading going on. Unfortunately we still lack a truly elegant way of detecting and dealing with hitting the quota limit. rclone will just keep trying and kind of stall, not that it matters since it won't be able to upload more anyway. it will work again as soon as it resets (sometime around midnight, but it varies from server to server).
If you want to mass-transfer easily and your local bandwidth is not quite suitable for that much data - I'd recommend using a Google Cloud microinstance VM (Linux based) to do the job for you. Importing data to google is free, and the free-use limits are more than enough for the task, so you can actually do it free (or spend a couple of dollars on a windows server for a week or two if you feel more comfortable in that environment). It's quite cheap really... even if you go above free-use limits. Besides, you get 300USD in free cedits to spend the first yet so yea... 
On a windows box you could literally just run the same script there and leave it running for 27 days - and those 20TB will be done on it's own... but of course it's not exactly hard to a much simpler Linux script for a simple mass-transfer if needed.