Well yeah, you just need to make a proper MS DOS or Win9x bootable floppy, maybe add a few utilities on it (the sys external command would be fine ^^), then add your floppy image to UBCD (see the Tutorials and HowTos section)
Of course, you'll need a FAT16 partition for DOS 6.22, and FAT16 or FAT32 for Win9x.
Hammerite Compendium of Precepts, Regimens and Rules of Conduct, Vol. 113 :
A stroke of thy chisel, once made, canst be undone, but a stroke thou dost not make from fear is a worse flaw.
Be not cautious - be correct.