KISS.
If you’re already in heading mode:
1. Note your current heading
2. Put fingers on heading knob
3. Turn heading knob in the direction you wish to orbit (clockwise for right hand orbit, anti-clockwise for left)
4. When selected heading has turned through 360 degrees and is back on your original heading, remove fingers from heading knob
5. Return to crossword
Advantages
1. It’s quicker
2. Pilot stays heads-up
3. No typing involved
4. No chance of b***erring up FMGC
Disadvantages:
1. Can’t think of any.