a cheap, small paint brush might be better, but yes - definitely an idea.
Please be sure not to buy anything synthetic for the job, and only those bristle types that are naturally anti-static (badger, black sable, boar). And don't reuse brushes that have been previously used for paint or other substances.
The calligraphy brush we have is natural hair. For paint brushes, I wasn't thinking of synthetic as they build up static charges, but good point to bring that up.