Forced diplomacy mod for DBM. All credit should go to Withwnar, I just followed his tutorial.
Installation is simple (dont forget to backup your files) and extract to the DBM folder. To use forced diplomacy, open up the diplomacy screen with a diplomat, hit the question mark in the upper right hand corner and click the 'show me how' button. If the button is greyed out just click on the adviser and it should then be clickable.
An example of how to activate forced diplomacy in game
Spoiler Alert, click show to read:
100% save game compatible