The LockInfo extension runs thru Winterboard as well as weather theme and LockInfo Theme, so I doubt it. You might get LockScreen stuff to work, but the notifications and weather forecasts would never update.
Hey, So I got it to work without winterboard.

I emailed David Ashman (The creator of LockInfo) and he wrote me back this:
You should be able to drop anything that's in a Themes/<theme>/Bundles directory into /Library/LockInfo/Plugins directory except for com.ashman.LockInfo. Those files would reside directly in /Library/LockInfo/.
dave
Anyone interested, here you go!
It worked like a charm. I did this all with iFile, but probably easier via some client on the computer.
Warning: ALWAYS backup your files.
First thing I did was copy my /Library/LockInfo folder and rename it _LockInfo so I'd have a backup. Then I just did what he said. Pasted the contents of the com.ashman.LockInfo to /Library/Lockinfo/ from my Gruppled theme folder.
Next, to get some of the springboard elements to work you have to modify your Springboard.app... Backing up is VERY important here.
I looked in the Themes/Gruppled/com.apple.springboard/ and put the images in there in my springboard.app file. I renamed all the originals from *.png to *.png.backup. The reason I did this so so I can create a script to restore my springboard by just doing
which should replace all my files that I modified with the originals.
Enjoy your "snappier" Lockscreen Info!
NOTE: The LockInfo package in Cydia has a dependency tied to Winterboard. You can't remove Winterboard after doing this or Cydia will remove the Lockinfo install as well. Does anyone know where I can get the Lockinfo package to install manually?