Yes, it is possible with AWDFLASH.
When you flash, it prompts you as to whether or not you want to save the old BIOS -- that is, the BIOS version that's on the chip (which in this case would be the new Badflash chip). Be VERY careful and attentive, though -- you're risking a write to the new Badflash chip.
I suggest using this command line:
where "bogus01.bin" is a non-existant file. That way, you'll get the "Save" prompt, and Awdflash should barf when it can't find bogus01.bin. Most Awdflash programs also have a verification prompt before writing the BIOS -- but I've seen a few versions that don't give this prompt.
While I've not seen the Reverend's code for K6 soft-clocking, I'm fairly sure it's similar to the Linux K6Mult utility. Putting it in as a BIOS Option ROM is a definite advantage for Badflash BIOS users.