there would be a little bit of flex in the canopy, but not much. if the canopy can be removed, is there any way of pushing the cockpit sides out. Probably not, I admit......
I wonder if there are after market canopies for this kit, they are usually thinner, more flexible plastic. might be another option.
If the two fuselage halves can come apart again, maybe what ozhawk did....put a spacer between the two halves
none of these suggestions are at all easy, and probably not do-able. You have my sympathies Sergio.