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After a few minutes of mucking about, thinking of possibly fabricating a temporary link using some wire, one of the city DPW trucks stopped to see if I was OK. He pointed out that he couldn't see me very well and recommended I put on some reflective tape. So, after giving me a rag to clean off my now greasy hands, I decided a field-fix of the chain was not possible. So, I decided to push the bike home. I found I could steer the bike as I pushed it without needing to bend down by attaching a pull-string to one of the steering stalks.
So, next trip I'll be packing some cord, a plastic bag (for greasy broken parts), my multi-tool and of course an extra quick-link!