Ok, so the requirements are not that crazy. Your solution makes sense. I agree that probably you need to use gain boosting in the first stage. My advice is that you first make the design without it and see how much gain is "missing". As you probably know the gain boosting complicates the frequency compensation due to the poles/zeros introduced, so it is a good solution to go one step at a time.
The signal swing at the output of the first stage is low because of the gain of the second stage. So, probably (depending on the input and output common-modes) you can still use a cascode amplifier (not folded cascode) because the secondary pole is at a higher frequency. You can rapidly analyze if this is possible.
If you are going to use the amplifier always with a gain of 2, you don't need to guarantee stability at the UGB. Basically you only have to guarantee a good phase margin at 425 MHz, i.e. the secondary poles must be at 3*425 to 4*425 and NOT at 3*850 to 4*850.
Finally there are alternatives to the miller compensation in two stage amplifiers, which may give better results. You can check Razavi book on this (it has an explanation and I think it also has the references you should check).
I hope this helps.
Regards