OpenBSD with GRUB2

I'm trying to install OpenBSD on a VPS with Debian/GRUB2.
I get bsd.rd, in GRUB2 I launch the installer with:
set root=(hd0,X)
kopenbsd /bsd.rd
boot

The installation is ok, but GRUB2 still remains.
So, when I reboot, GRUB2 menu appears, and OpenBSD can be started only with:
set root=(hd0,X)
kopenbsd /bsd
boot

I would like to automatically start OpenBSD at reboot.

Is it possible to overwrite GRUB2 in the installation process?
Or, is it possible to add a GRUB2 entry in OpenBSD?