removing grub and restoring w10 bootloader without access to administrative account in w10

I have a dual boot with W10 and debian. Grub is installed in MBR. I would like to remove grup altogether (and even debian) and restore to W10 bootloader. The restriction is that I cannot login to w10 and even if i could, i do not have admin rights. I have full access to debian. Alternatively, an acceptable solution is to change grub such that it boots w10 by default with zero delay.