i imagine the reg size Nikki is not suitable as a crossbody cuz it's just too big
I don't think so - I have the marc by marc jacobs too hot to handle large tote which is about the same size that I wear crossbody.
just googled it and it's huge!
the style in your description is exactly a Rikki
http://www.shopbop.com/mini-rikki-bag-rebecca-minkoff/vp/v=1/845524441861897.htm
i have not tried to hook a shoulder strap to my Nikki. maybe i will try it this weekend
i imagine the reg size Nikki is not suitable as a crossbody cuz it's just too big