You'll need hardboot.com, as shipped by IBM with WorkSpace On Demand for OS/2. This is actually a small DOS program which can be run to restart booting off the local harrdisk. It re-hooks the bootstrap interrupt to only boot off the harddisk the second time around.
Under WSOD, it is used to allow a network client to boot of its LAN adapter (or floppy disk for RPL emulation), check the server for updates or re-partition/re-load the OS on the harddisk, and then restart booting (without going back through POST etc) off the local HDD.
Cool, eh? I don't have a copy of hardboot.com to hand, but anyone with WSOD2 will have it...
Though this can be achieved by ejecting the disk from floppy drive after the first step. Would like to explore whether this can be automated.