I see two cases:
1) Your play a 4-manual organ with a 3-manual console. This organ should have the chamades on the 4th manual and you wish play the 3 first manuals alternating with the chamades. In this case the 3rd manual of your console could play the chamades with IV to III and III to III Unison off.
2) You have a Bourdon 8' and you wish to have Bourdon 16' and Flûte 4' but this division doesn't have them. You just have to put this Boudon 8' with the sub coupler, the octave coupler and the Unison off.