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Maybe look intoo electric tandems, they're built for two, so no problem on the weight side, and as they're longer you have more room for storage.
Plus, consider the weird factor: drivers can get irrational about cyclists, but if you are riding a wierd contraption they might be to confused or intrigued by the novelty to care.
additional as you become fitter, you can invite people on rides.
con. is obviously the price, but then you could diy an ebike.