How do I reduce the bit depth of images to 1-bit within Acrobat 9?

I am hoping a simple solution exists within Acrobat 9 for reducing the bit-depth of images to 1-bit.
I know of two methods that both seem more like workarounds. One, edit the image using Photoshop. Two, without Photoshop, export the page as a 1-bit PNG and recreate the page in Acrobat. It seems like one of the preflight fixups should be able to get it done with the right settings. But, it's a labyrinth of unfamiliarity.

There's no predefined 1-bit conversion in Preflight because it doesn't make sense. Preflight will not dither bitmaps, so most images will become black squares. Extreme color conversion is only intended for text/vector objects.
If you want to try it anyway, you can create a custom Fixup if you have a 1-bit ICC profile.
Preflight > Single Fixups
Options menu > Create new Preflight Fixup
Name it something like "Convert all to 1-bit BW"
Search for "Convert colors" in the type of fixup box and add it
Destination tab > Destination > your ICC profile for 1-bit black
Uncheck "use destination from Output Intent"
Keep everything else as default, though I'd suggest using "Embed as output intent for PDF/X" if you're making PDF/X documents
Conversion Settings tab > All Objects + Any Color (except spot) + Convert to destination + Use rendering intent
Press the + key to duplicate this step, and change the second copy to "Spot Color(s)"
Press + again and change the third copy to "Registration color"
Save the fixup and run it.
In case you don't have a 1-bit ICC profile installed, I've attached one.

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How do I reduce the bit depth of images to 1-bit within Acrobat 9?

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