Isolated power supply with Vout = Vin
You could implement the isolated supply using a transformer or coupled inductor with a turn ratio of 1:1.3 in conjunction with a transformer driver IC and a LDO.
Using the transformer and the driver you can create an isolated voltage supply which is slightly higher than the input voltage. The LDO then regulates it to the original value.
This configuration can be implemented relatively small, cheap and efficient, depending on your needs and the selected components.