About a week ago I needed to travel to a job interview.The trip involved bus and train. As th ebus approached I noticed that the front rack was full. I released the center hinge on my Dahon and got no flack as I rolled it onto the bus with that fold only.
Now I realize that folded that way really saved no space; however, it did show compliance with the rules. I think the ideal would be a full size folder like the Montague bikes. If I were ever to get another folder, that is probably the way I would go.
The mini-velo would not suit me. About the only advantage is the ease of snaking through doorways (at least compared to the recumbent that I prefer to ride). The mini-velo still does not get around the "folding bikes only" rules and still has the small tires.