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So in other words, you want to use a different Apple ID on your iPad ? and you don't care whether you erase everything on it or lose any data or configuration on it?
How about regaining access to it by way of the old Apple ID, by regaining that Apple ID's password, then using that access to change the Apple ID on it? that might be the best way to try going about it.
IF you wanted to try it that way, this could help you get your (former) Apple ID's password ***** (- unless you've already tried this way, of course):
Then that isn't possible.
Try this method of wiping the iPad back to a clean slate:
- connect the iPad to a computer with a USB cable.
- start iTunes on the computer
- does the iPad ask for a password ***** this point?
Let me know what happens, please. Thanks.