I'm calling around your area to data centers and I found one that you may want to look into.
https://www.123.net/data-center/
Specifically looking at https://www.123.net/wp-content/uploads/Data-Center-Tech-Specs-DC1-WEB.pdf
FIXED WIRELESS
• Up to 10 Gbps Speeds (99.99% SLA)
• 55+ Wireless Point of Presence (PoP) Sites Across Michigan
• 128-bit AES Encrypted Data Transport
• Primary & Backup Connectivity for Dedicated Internet & Ethernet Services
• Emergency / Short-Term Deployments
• Campus Wireless Solutions
• Temporary Fixed Wireless Solutions (Events / Construction Site)
Their HQ is in Southfield, MI. Only about 40 miles away. If you can't get the fixed wifi solution you may want to ask them (or other data centers near Detroit) if you could work a deal with them to upload the files for you. You could 2 day a USB to them for really cheap and it may even get to them in 1 day. I think $0.10 per GB is a fair price for both of you. But they might not want to touch your files.
Hopefully you can get that fixed wifi solution, even at a degraded speed it may be better than your other options. Give them a call and get some details. I'll keep looking too.
Even if you get just 5 Mbps upload it would make it more doable. 23 hours per 80GB.