is what I want to do possible?

I don't think so. AFAIR Windows 98 fails unless it occupies the active primary partition of the first disk. Win2K (or, at least, NT4, which was the last time I tried this) isn't so fussy and will happily go anywhere, so you could reshuffle your disks to do this -- at the expense of (probably) reinstalling Win2K in the "same" place, which has become a different drive letter.

Peter