This is just a regular banon approach, but done for a blue.
It's not fancy. You soak grape leaves in brandy. Alcohol cooks the leaves. Fin.
If you want to optimize it, of course, there are various parameters:
- CaCl2 addition to help maintain crispness, else will be rather wilty
- can pre-boil to remove some of the grapey flavor and make more mellow, to highlight the brandy
- Can adjust pH down to match cheese pH. Add vinegar or other acid
- Can vac pack after wrapping to help retain max brandy flavor
And, naturally, you want high alcohol content, to ensure nothing grows on the leaves as they soak in the brandy, and as mentioned earlier to help cook them.
Again, past thread suggestions apply. If you soak in wine, won't work. If you soak in mead, won't work. If you want to add mead aroma/flavor, along with a grape wrap, alter your maceration schedule and approach so the chemistry works.