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There's this kind of thing but it's not compatible with my JetFluid Pro. I'm sure when I had a look, the only way to fit a bigger bike in was to somehow disassemble the clamp and fit a replacement - which doesn't seem to exist. Anyway, it's not drama as I use my Shiv in this for warming up at races only.
https://www.amazon.com/CycleOps-Trainer-Adapter-148X12mm-142X12mm/dp/B00KSCZQZE
How much do you want for your Fluid2? I'll pass on the details to my mate.
Saris do their own version too and say it is compatible