You would be better advised to find a full bespoke tailor such as Chris Kerr or CaTD. There have bee good reports of the latter but Kerr seems under rated.
Avoid MTM which is merely adjusting an existing block and is not going to achieve what you want.
Yes, an interesting move.
It would be preferable to have the hidden pocket in the waistband as many tailors offer in that region rather than that silly watch pocket below it which is too narrow to be of real use in the modern world.