I really couldn't tell you - mainly because I don't know (heck, I wouldn't even know which files you would need to replace ... even if you could SSH in).
However. Do you have OpenSSH installed? If yes, you might be able to get in to put the iPad into Safe Mode via SSH. Then, if you can get it into Safe Mode, you might be able to remove the tweak (from Cydia) that's causing the issue.
If you can SSH in, try this (with thanks to f4780y who posted these steps):
Here’s how you can enable “Safe Mode†manually on the iPad:
1. Open MobileTerminal on the iPad (If you’re unable to do so proceed with Step#2, else skip to Step#3)
2. SSH to the iPad using WinSCP/PuTTy (Windows) or Terminal (Linux or Mac)
3. Login using the following default values (provided you haven’t changed them yourself):
UserName: root
PassWord: alpine
4. Once logged in, enter the following command
killall -SEGV SpringBoard
As an alternative (if the above command does not work) try...
touch /var/mobile/Library/Preferences/com.saurik.mobilesubstrate.dat
5. Respring the SpringBoard
Couple of caveats. I've not tried this myself. And, even if you get into Safe Mode, I can't tell you if you'll be able to successfully uninstall the tweaks you wish.
Good luck.
Marilyn