As always with pastries, cold is your friend, if you feel that the dough is getting too soft and unmanageable, put everything on a plate for 15 minutes in the freezer, and pick up where you left off.
You will notice that we do not glaze
the raisin breads, this is the exception in viennoiserie which is explained by the presence of pastry cream.
The quantities of custard and raisins are indicative, feel free to adapt to your taste.
Staying on the same principle, a roll of croissant dough and a cream, you can decline this recipe according to your desires by replacing the pastry cream by a pistachio or chocolate version, and/or the grapes by cranberries, goji berries, etc. Let your imagination run wild.