Customizing GRUB cryptodisk prompt

I have configured encrypted /boot with GRUB (Archwiki: Encrypted Boot). On start it asks for luks pass phrase to unlock boot as shown below:

I am aware of plymouth for prettifying the luks prompt following the GRUB but that is not applicable here. I was wondering if there is any way to customize or prettify (theme) this prompt? If nothing else I will prefer a bigger font and preferably hide the long disk id.