I am currently working on a project on which I'm asked to design a virtual keyboard that would replace the default one when a user needs to fill a form on the mobile version of all our websites and even clients' websites. From what I've been told, the goal is to supposedly increase forms conversion by making the virtual keyboard easier to use than the built-in one.
Personally, I believe that it's totally wrong on a usability perspective because users already know the built-in virtual keyboard on their device and abruptly showing a different one would only confuse them. I also believe that it's not the input method that needs to be changed in order to boost conversion rate but the form itself.
Here is my question : can you direct me to some solid reference that backs up my claim that showing a different input method is totally wrong and won't increase the conversion rate at all?
Thanks in advance for the help.