Mark (wannabe) actually brought back a 2012 subframe assembly from the factory last month and we (GoFasters) are already working on a replacement plate for quicker access. Give it some time and we'll come up with a solution.
IMO the battery box and slide in air filter are changes that will be needed as GasGas goes the "Direct Inject" route and "the cart obviously got a little ahead of the horse" as GasGas has chosen to stick with a carburator for 2012and went back to the conventinal air filter design.
Historically GasGas sticks with a basic subframe, airbox, frame, etc. configuration for three to five years and I would bet DI will be in place by then and the battery box and slide in airfilter design will then pay dividends.