Most likely larger rings can be mounted on the crank. Possibly the ft der will work with them, possibly not so well. Some CX ft ders are designed around the 46T ring curve and height off the shell. Possibly the chain will need lengthening/replacement and if worn the cassette might then need replacement too. Ft shifting set up can be less plug and play then the rear so sometimes trying is the easiest way tio find out.

Not asked for but... A 46/11 combo will allow about 20mph per 60 cadence. 40mph would be about 120rpm. Do you know your cadence range? While it's easier to spend $ to get "faster gears" it's generally considered a skill of better riders if they can spin the cranks at a faster cadence. Lot's of reasons why.

I run 46/11 high gear on a few bikes and have little issue getting up to 30mph on a flat (though not for long as I have a small engine) and exceed 45+mph often down hills. Of course how fast we go is a poor judge of how good a rider we are Andy