Does the clan Ewing of Dumbartonshire have a current chief? The U.S. or in Scotland? I cannot find any info on the web.

I want to formally ask for permission to wear a sporran that has their crest affixed (NOT ARMS). I am not a Ewing, and I am sure it won't be a problem, but I would like to do things properly. I would have the crest changed out to my own clan but the item is antique and I don't wish to "disturb" the item just yet in this fashion.

Any contact information would be greatly appreciated.