Will be done right away.
If any other, just bleep

part 1: binary edits

1.) copy boot.bin (your 2kb CD boot sector) to boot2.bin
2.) open boot2.bin with hex editor, replace setupldr.bin with myloader.bin
3.) copy setupldr.bin to myloader.bin and open in hex editor
4.) make following changes (for every occurrence):
    setupdd.sys changes to ddsetup.sys, txtsetup.sif to setuptxt.sif, winnt.sif to winnt.org
5.) copy setupdd.sys to ddsetup.sys and open in hex editor
6.) search for unicode string dosnet.inf and change to netdos.inf
7.) use modifype to fix crc in ddsetup.sys and then compress if you want
8.) uncompress setup.org, rename to setp2.exe, compress if you want

part 2: text edits

1.) winnt.org should be fine, but double check that it has what you want
2.) copy dosnet.org to netdos.inf and open in notepad
3.) in [Files] section replace d1,setup.exe with: d1,setp2.exe
4.) in [Files] section add: d1,ddsetup.sys and leave the setupdd entry
5.) copy txtsetup.org to setuptxt.sif and open in notepad
6.) in [SourceDiskFiles] replace setup.exe line with: setp2.exe = 100,,,,,,,2,0,0,setup.exe
7.) in [SourceDiskFiles] add: ddsetup.sys = 100,,,,,,3_,,3,,,1,4

now you're finished, just point your bootloader of choice to boot2.bin for your non driverpacks installation, and of course use your original boot.bin for the driverpacks installation
don't forget to delete bootfix.bin when you make a multiboot disk

hopefully I didn't forget anything...