The updated Braille Formats book is not yet approved by BANA. The Formats Committee is recommending that foreign words in an English context be uncontracted (following BF 2011). The UEB codebook does allow for contractions to be used...and it does allow for the governing braille authority to choose to do things differently (as you noted below). The current document for Formatting is BF 2011. Until that is updated, I suggest you follow those formatting rules when transcribing UEB. Especially since UEB does not address formatting. This would not apply to a work that is considered a foreign language document...it only applies to foreign words within an English context.