You can’t use the begin/end CBC indicators. BUT you should use the opening/closing non-UEB passage indicators to let the reader know you are not working in UEB anymore…and, of course, that will need to be explained somewhere (if this is the only flow chart, put a TN right before). Also, according to example 1 of the flow-chart document, you don’t need to use uncontracted braille. I’m attaching my version.
Cindi