Just stumbled upon KunamiMata's method and gave it a shot for kicks. I think I may have reclaimed enough of my Shepard to go ahead:

My phone has washed out much of the color/detail from the CC screens, but in practice, many of the features line up. The ME2 shots were taken in the dark, the ME3 shots were taken in bright daylight.
Things that didn't translate / I had to fix on my own:
- Complexion
- Iris Color
- Nose Shape
- Hair
- Beard (ME3 has two variants of 5 o'clock shadow, I went with the heavier one)
- Facial Hair Color
I think I'm going to go with this approximation. He seems a little heavier. Also, ME1/ME2 Shepard had a really weird underbite which I was never crazy about (but got used to), but couldn't even figure out how to reproduce it in ME3's CC.
I'll have to write in my own canon about how Shepard got some nip/tuck surgery done and put on a few pounds after leaving the Normandy.
Just wanted to share my experiences with the method below - it doesn't make BioWare's mistake any less absurd, but it might help folks who just want to move on...
Thanks KunamiMata!
KunamiMata wrote...
Not really. I kind of went with a mishmash of things I found and trial and errored them until I found something that worked.
Here is basically what I did.
1. Start a brand new Mass Effect 2 save file with your Mass Effect imported Shepard. It has to be brand new, because you're going to need to move, not copy it, to a USB flash drive that is formatted to work on your 360. You don't want to do this with your finished game save, so make sure it's a new one (i.e. right when you wake up from your coma, save and quit).
2. Go to Settings in your dashboard, System, Storage, Hard Drive and find your Mass Effect 2 save (not "Mass Effect 2 Importer"). Inside, you should find files for all your DLC and each of your careers. They will all be named after your Shepards and dated. Move the career you just created to your USB flash drive (don't copy, because the Xbox won't allow it).
3. Download and install this program on your PC (it's best to have this version): hotfile.com/dl/143431599/02eaea8/Modio_3.zip.html
4. Plug your USB flash drive into your PC, and using Modio, select Open from a device. Click the device you see. Mass Effect 2 should pop up in that list. Select it, then select your Shepard's save file. When the following window pops up, click the File Contents tab at the top. You should see several .xbsav extensions. Right click one of them and extract them all to your desktop (or where ever you prefer).
5. Go to this website and register on it: legion.cal24.pl/me2/
6. Once you've registered at that site and logged in, click the My saves tab at the top of the page. The specific save file that you extracted to your desktop (or where ever) that you're going to want to upload here should be named Save_0001.xbsav. Go ahead and upload that save on this site.
7. You should now have one save listed at the top of that page with a string of options following it. The second to last option on that row is Morph head. Click that option.
8. Now new options show up. You want to click Export YAML. It should download a file to your computer called morphhead.yaml. Check this file in Notepad to make sure it's all in code that you can read (only read, not necessarily understand), otherwise the file is mucked up and you have to try this step again.
9. Once you have a decent YAML file to work with, upload it in one of two places, depending on the sex of your Commander Shepard -
Female Shepards will upload here: masseffecttools.99k.org/femshep_upload.php
Male Shepards will upload here: masseffecttools.99k.org/maleshep_upload.php
Remember to add your Shepard's name, because it's how you recover the face template code.
10. Lastly, you're going to want to get your Shepard's code, again in one of two places depending on the sex -
Female Shepards codes are here: masseffecttools.99k.org/femshep_code.php
Male Shepards codes are here: masseffecttools.99k.org/maleshep_code.php
All you need to do now is enter the name you typed when you uploaded your YAML file, and bam, instant Shepard readout and code for your Shepard. There will be a little tweaking required (as pointed out by the ***** asterisks), but it shouldn't be anywhere near as bad as trying to recreate your Shepard from scratch. It'll generally be little things like hairstyle, makeup color, or eye color. You know, the easy things to remember and fix. Everything without the ***** next to them should be correct, though.
And that's pretty much how I got my Shepard back without waiting for any sort of patch. You just enter that code you get at the bottom of that page into your custom character creation back on your 360 copy of Mass Effect 3 and do the necessary tweaking and you're done.