I wonder what type of current signals you're trying to measure, that you need such fast opamps.
I haven't checked the specs on that opamp but note that all the noise figures get amplified 100 times ;-)
The combined cascading bandwidth is specified at -3db attenuation, so you may get higher bandwidth out of box, just more attenuated.
This type of change would only benefit the raw output since digital sampling cannot keep up with such fast signals you're trying to get.
I would just try it with the original opamps and then do the hack if you're up for it.
Also, definitely a at-your-own risk type of change, but I am interested in your progress and results.