It is unlikely that mountain boots will fit well with the EA universal binding because they typically have a very stiff sole designed for use with ice crampons. The binding has a hinge under the heel, and the shoe must be able to flex at this point to prevent damage to the binding.
As for modifying the bandage, we do not recommend doing so as it may compromise the performance and safety of the product, and any modifications would void the warranty. We recommend using shoes that are compatible with the EA universal binding.