[Q] XXLSA to Official Stock/Factory ROM

1. I have the International version of GT-N7000
2. All official until I manually updated to XXLSA JB 4.1.2 using Odin (I cant wait for official to come via OTA thats why)
3. Now I cant use Kies as it says it dont recognize it (you know what i mean)
4. I dont care about kies enyway.

My question is, can I,

1. Let say remove this XXLSA ROM and go back to Stock (i think its ICS or something)
2. Then I will try to update it via OTA again. where in I'll be getting the Official JB then.
3 I just want to go back all official ROM again thats it.

anyone...please help....