I bought a Wakebooster when I purchased my 252SE and it does in fact fit.....Just not exactly how it is supposed to. If you maneuver it enough you should be able to get it installed. I installed mine on land, and while in the water. (Installing in the water got a little tricky, but doable. I noticed a slight difference in the wake with it installed, but I dont have any ballast bags, so I'm hoping those will help once purchased.
As you can see on the pics, it will securely connect, but the part that goes towards the center of the boat will overhang the transom slightly. There is enough surface area contact that I feel this can function appropriately with the correct ballast setup. You could also remove the seat brackets and seal the holes, or move them closer to center. (Not sure what the mounting hardware would entail...Screws vs bolts n nuts) Or do like you said and cut the booster to fit, which is what I will most likely do.
If you can wait for the Gantlin to come on the market for sale, I would just return the Wakebooster since it doesnt fit properly. But if you're ready to surf asap, and dont want to wait for them to hopefully get to market this year, just get you some bags and Surfs up!
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