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I have some friends who have an 8 speed freewheel on their tandem and that works fine. I have a spare 7 speed that you're welcome to borrow if you want to try it?
You might need to space your hub out slightly more, depends on your frame. You can do a quick calculation using Sheldon Brown's cribsheet to see if you have enough space.If you have the suzue rear hub you might have issues with axles bending/snapping due to the increased leverage, there's an idea here for adding an extra bearing at the end of the freewheel to support the most outboard gears.
hamrack
My rear hub uses screw on freewheels.
Are 7 speed shimano fine?
Do they hold up well to tandem use?