well- no problem- I dance mostly Argentine tango now so am not up on all the ballroom shoe availability. For practice shoe- I know there are adjustable front shoes, usually mesh with lace up- which will accomodate a wider foot. For closed toe shoes- I"d say your best bet is too see what may be out there that has a very rounded toe area. The pointy toes are going to fit narrower. Sorry I don't have more info- best of luck in your search! Maybe they'll start making something soon, but I thought I had seen some buckle type fronts on standard shoes a year or so ago. ???? Can't remember where.
For tango practice, I use my Aris Allen Rugcutter's. They are super comfortable, all leather and have a small flexible platform so I can stay on my feet for a long time. They have a lace-up front that will accomodate most feet unless very wide or very narrow and becasue they are suede, will last a long time.