It’s possible on a UEFI machine.
Use
$ sudo efibootmgr --bootnext XXXX
where XXXX is the boot entry of your usb device. To get a list of all available entries:
$ efibootmgr
BootCurrent: 0000
Timeout: 0 seconds
BootOrder: 0000,0002,0001,2002,2003,2001
Boot0000* manjaro
Boot0001* EFI PXE 0 for IPv4 (80-FA-5B-8C-59-E9)
Boot0002* Arch Linux EFISTUB
Boot2001* EFI USB Device
Boot2002* EFI DVD/CDROM
Boot2003* EFI Network
So this would amount to
$ sudo efibootmgr --bootnext 2001 && systemctl reboot
on this machine.