BODI XI R2: downgrade batch job from 11.5.x to 11.0.x

Situation:

Job with similar required functionality is in a repository with version 11.5.x

Same functionality is required in a different project with repository version 11.0.x

Technical build, political reasons and split in organisation divisions prevents from using the 11.5.x repository. Upgrading to the newest environment (11.7.3.x) is not possible as not all jobs are signed off.

Due to the complexity of the job it is not really preferred to manually recreate the job in the 11.0.x environment. Estimate is at least 3 build days and the risk at mistakes.

Preferred is the same trick as upgrading jobs in a repository, but now to downgrade. But that seems not possible.

Any clues if there is a possibility to do this?