Actually, I had a similar question about it relating to the altitude. But, when I put the question to one of our Flight Planning guys - performance engineer - he showed me how this procedure would work - with the caveat - that it would not be approved, blah, blah.
Disclaimer: Only your companies approved data and SOP is permitted for operations purposes.
It is the "Operators Responsibility" to provide the data/ procedure, when the aircraft can not comply with the standard missed approach climb gradient, etc, etc.