Here are some alternatives to express the idea of "supporting extreme change" using different wording:
- Promoting radical transformation
- Encouraging significant shifts
- Facilitating drastic alterations
- Advocating for profound change
- Backing substantial reform
- Championing major adjustments
- Endorsing revolutionary changes
- Assisting in comprehensive evolution
- Upholding substantial modifications
- Fostering radical developments
Feel free to choose any of these phrases according to the context in which you plan to use them!