To use Scrum, you arguably need to apply it wholly. However, some practices are not unique to Scrum: practices all teams can benefit from.
It might also be an eye-opener for people, making them more inclined to turn fully agile. I recently switched from a project doing Scrum to a team with no clear project methodology or framework: the change in the level of communication and willingness to change and improve was striking. I think these three things alone would go a long way to improve the situation.