Hmmm....EOL 2012...If we go with the Maya, everything will be EOL :D
just kidding...
So I cannot say if the migration is possible, but I do not believe it.
Also, I am not really into licensing, but I think in the multi-tier protection the license for SBG is included. This leads to the question if the appliance can be used for SBG.
The last thing I know is, that multi tier protection is no longer sold and the recommendation is to change to Protection Suite.
I know, this does not really help you...sorry